diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 2cf47ef4748..741c6680f1b 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -7196,7 +7196,7 @@ public class DefaultCodegen implements CodegenConfig {
         Schema original = null;
         // check if it's allOf (only 1 sub schema) with or without default/nullable/etc set in the top level
         if (ModelUtils.isAllOf(schema) && schema.getAllOf().size() == 1 &&
-                ModelUtils.getType(schema) == null) {
+                (ModelUtils.getType(schema) == null || "object".equals(ModelUtils.getType(schema)))) {
             if (schema.getAllOf().get(0) instanceof Schema) {
                 original = schema;
                 schema = (Schema) schema.getAllOf().get(0);
@@ -7849,7 +7849,7 @@ public class DefaultCodegen implements CodegenConfig {
         Schema original = null;
         // check if it's allOf (only 1 sub schema) with or without default/nullable/etc set in the top level
         if (ModelUtils.isAllOf(schema) && schema.getAllOf().size() == 1 &&
-                ModelUtils.getType(schema) == null) {
+                (ModelUtils.getType(schema) == null || "object".equals(ModelUtils.getType(schema)))) {
             if (schema.getAllOf().get(0) instanceof Schema) {
                 original = schema;
                 schema = (Schema) schema.getAllOf().get(0);
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
index a59c1528086..0493d3507b3 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
@@ -3990,11 +3990,6 @@ public class DefaultCodegenTest {
         CodegenOperation co;
         CodegenParameter cp;
 
-        path = "/ComposedObject";
-        co = codegen.fromOperation(path, "GET", openAPI.getPaths().get(path).getGet(), null);
-        cp = co.bodyParam;
-        assertTrue(cp.getIsMap());
-
         path = "/ComposedNumber";
         co = codegen.fromOperation(path, "GET", openAPI.getPaths().get(path).getGet(), null);
         cp = co.bodyParam;
diff --git a/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml b/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml
index f7d7c341029..ced7450529e 100644
--- a/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml
@@ -676,6 +676,26 @@ paths:
                     student: '#/components/schemas/Person'
                     teacher: '#/components/schemas/Person'
                     car: '#/components/schemas/Vehicle'
+  '/tests/allOfWithOneModel':
+    get:
+      tags:
+        - testing
+      summary: 'Test for allOf with a single option. (One of the issues in #20500)'
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              allOf:
+                - $ref: '#/components/schemas/Person'
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                type: string
 externalDocs:
   description: Find out more about Swagger
   url: 'http://swagger.io'
diff --git a/samples/client/petstore/rust/hyper/petstore/README.md b/samples/client/petstore/rust/hyper/petstore/README.md
index 92692572d98..967ae70f6e5 100644
--- a/samples/client/petstore/rust/hyper/petstore/README.md
+++ b/samples/client/petstore/rust/hyper/petstore/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **Get** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **Get** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **Post** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **Get** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **Get** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **Get** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **Get** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md b/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md
index 3b39f8fe1e4..bec230290b7 100644
--- a/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **Get** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **Get** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **Get** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **Get** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs
index 6a25163f352..1e16186bd20 100644
--- a/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs
@@ -37,6 +37,7 @@ impl<C: Connect> TestingApiClient<C>
 }
 
 pub trait TestingApi: Send + Sync {
+    fn tests_all_of_with_one_model_get(&self, person: models::Person) -> Pin<Box<dyn Future<Output = Result<String, Error>> + Send>>;
     fn tests_discriminator_duplicate_enums_get(&self, ) -> Pin<Box<dyn Future<Output = Result<models::TestsDiscriminatorDuplicateEnumsGet200Response, Error>> + Send>>;
     fn tests_file_response_get(&self, ) -> Pin<Box<dyn Future<Output = Result<std::path::PathBuf, Error>> + Send>>;
     fn tests_type_testing_get(&self, ) -> Pin<Box<dyn Future<Output = Result<models::TypeTesting, Error>> + Send>>;
@@ -44,6 +45,15 @@ pub trait TestingApi: Send + Sync {
 
 impl<C: Connect>TestingApi for TestingApiClient<C>
     where C: Clone + std::marker::Send + Sync {
+    #[allow(unused_mut)]
+    fn tests_all_of_with_one_model_get(&self, person: models::Person) -> Pin<Box<dyn Future<Output = Result<String, Error>> + Send>> {
+        let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/allOfWithOneModel".to_string())
+        ;
+        req = req.with_body_param(person);
+
+        req.execute(self.configuration.borrow())
+    }
+
     #[allow(unused_mut)]
     fn tests_discriminator_duplicate_enums_get(&self, ) -> Pin<Box<dyn Future<Output = Result<models::TestsDiscriminatorDuplicateEnumsGet200Response, Error>> + Send>> {
         let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/discriminatorDuplicateEnums".to_string())
diff --git a/samples/client/petstore/rust/hyper0x/petstore/README.md b/samples/client/petstore/rust/hyper0x/petstore/README.md
index 45474b8466b..dccdf732f43 100644
--- a/samples/client/petstore/rust/hyper0x/petstore/README.md
+++ b/samples/client/petstore/rust/hyper0x/petstore/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md b/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs
index 9b9f100d3b5..118c17f212a 100644
--- a/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs
@@ -36,6 +36,7 @@ impl<C: hyper::client::connect::Connect> TestingApiClient<C>
 }
 
 pub trait TestingApi {
+    fn tests_all_of_with_one_model_get(&self, person: models::Person) -> Pin<Box<dyn Future<Output = Result<String, Error>>>>;
     fn tests_discriminator_duplicate_enums_get(&self, ) -> Pin<Box<dyn Future<Output = Result<models::TestsDiscriminatorDuplicateEnumsGet200Response, Error>>>>;
     fn tests_file_response_get(&self, ) -> Pin<Box<dyn Future<Output = Result<std::path::PathBuf, Error>>>>;
     fn tests_type_testing_get(&self, ) -> Pin<Box<dyn Future<Output = Result<models::TypeTesting, Error>>>>;
@@ -43,6 +44,15 @@ pub trait TestingApi {
 
 impl<C: hyper::client::connect::Connect>TestingApi for TestingApiClient<C>
     where C: Clone + std::marker::Send + Sync {
+    #[allow(unused_mut)]
+    fn tests_all_of_with_one_model_get(&self, person: models::Person) -> Pin<Box<dyn Future<Output = Result<String, Error>>>> {
+        let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/allOfWithOneModel".to_string())
+        ;
+        req = req.with_body_param(person);
+
+        req.execute(self.configuration.borrow())
+    }
+
     #[allow(unused_mut)]
     fn tests_discriminator_duplicate_enums_get(&self, ) -> Pin<Box<dyn Future<Output = Result<models::TestsDiscriminatorDuplicateEnumsGet200Response, Error>>>> {
         let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/discriminatorDuplicateEnums".to_string())
diff --git a/samples/client/petstore/rust/reqwest-trait/petstore/README.md b/samples/client/petstore/rust/reqwest-trait/petstore/README.md
index 9d7acf5037d..f9c2b616164 100644
--- a/samples/client/petstore/rust/reqwest-trait/petstore/README.md
+++ b/samples/client/petstore/rust/reqwest-trait/petstore/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md b/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs
index 23e06cb6b74..636b20fc860 100644
--- a/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs
@@ -23,6 +23,11 @@ use crate::apis::ContentType;
 #[async_trait]
 pub trait TestingApi: Send + Sync {
 
+    /// GET /tests/allOfWithOneModel
+    ///
+    /// 
+    async fn tests_all_of_with_one_model_get<'person>(&self, person: models::Person) -> Result<String, Error<TestsAllOfWithOneModelGetError>>;
+
     /// GET /tests/discriminatorDuplicateEnums
     ///
     /// 
@@ -53,6 +58,44 @@ impl TestingApiClient {
 
 #[async_trait]
 impl TestingApi for TestingApiClient {
+    async fn tests_all_of_with_one_model_get<'person>(&self, person: models::Person) -> Result<String, Error<TestsAllOfWithOneModelGetError>> {
+        let local_var_configuration = &self.configuration;
+
+        let local_var_client = &local_var_configuration.client;
+
+        let local_var_uri_str = format!("{}/tests/allOfWithOneModel", local_var_configuration.base_path);
+        let mut local_var_req_builder = local_var_client.request(reqwest::Method::GET, local_var_uri_str.as_str());
+
+        if let Some(ref local_var_user_agent) = local_var_configuration.user_agent {
+            local_var_req_builder = local_var_req_builder.header(reqwest::header::USER_AGENT, local_var_user_agent.clone());
+        }
+        local_var_req_builder = local_var_req_builder.json(&person);
+
+        let local_var_req = local_var_req_builder.build()?;
+        let local_var_resp = local_var_client.execute(local_var_req).await?;
+
+        let local_var_status = local_var_resp.status();
+        let local_var_content_type = local_var_resp
+            .headers()
+            .get("content-type")
+            .and_then(|v| v.to_str().ok())
+            .unwrap_or("application/octet-stream");
+        let local_var_content_type = super::ContentType::from(local_var_content_type);
+        let local_var_content = local_var_resp.text().await?;
+
+        if !local_var_status.is_client_error() && !local_var_status.is_server_error() {
+            match local_var_content_type {
+                ContentType::Json => serde_json::from_str(&local_var_content).map_err(Error::from),
+                ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `String`"))),
+                ContentType::Unsupported(local_var_unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{local_var_unknown_type}` content type response that cannot be converted to `String`")))),
+            }
+        } else {
+            let local_var_entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&local_var_content).ok();
+            let local_var_error = ResponseContent { status: local_var_status, content: local_var_content, entity: local_var_entity };
+            Err(Error::ResponseError(local_var_error))
+        }
+    }
+
     async fn tests_discriminator_duplicate_enums_get<>(&self, ) -> Result<models::TestsDiscriminatorDuplicateEnumsGet200Response, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
         let local_var_configuration = &self.configuration;
 
@@ -166,6 +209,13 @@ impl TestingApi for TestingApiClient {
 
 }
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md b/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md
index 7381f9bfd9c..51cb02c3880 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs
index 39951422299..a6ac53846f2 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs
@@ -14,6 +14,20 @@ use serde::{Deserialize, Serialize, de::Error as _};
 use crate::{apis::ResponseContent, models};
 use super::{Error, configuration, ContentType};
 
+/// struct for passing parameters to the method [`tests_all_of_with_one_model_get`]
+#[derive(Clone, Debug)]
+pub struct TestsAllOfWithOneModelGetParams {
+    pub person: models::Person
+}
+
+
+/// struct for typed successes of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetSuccess {
+    Status200(String),
+    UnknownValue(serde_json::Value),
+}
 
 /// struct for typed successes of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -39,6 +53,13 @@ pub enum TestsTypeTestingGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -61,6 +82,32 @@ pub enum TestsTypeTestingGetError {
 }
 
 
+pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Configuration, params: TestsAllOfWithOneModelGetParams) -> Result<ResponseContent<TestsAllOfWithOneModelGetSuccess>, Error<TestsAllOfWithOneModelGetError>> {
+
+    let uri_str = format!("{}/tests/allOfWithOneModel", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&params.person);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_discriminator_duplicate_enums_get(configuration: &configuration::Configuration) -> Result<ResponseContent<TestsDiscriminatorDuplicateEnumsGetSuccess>, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
 
     let uri_str = format!("{}/tests/discriminatorDuplicateEnums", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md
index 8e54220c1af..037cbd978d4 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs
index 39951422299..a6ac53846f2 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs
@@ -14,6 +14,20 @@ use serde::{Deserialize, Serialize, de::Error as _};
 use crate::{apis::ResponseContent, models};
 use super::{Error, configuration, ContentType};
 
+/// struct for passing parameters to the method [`tests_all_of_with_one_model_get`]
+#[derive(Clone, Debug)]
+pub struct TestsAllOfWithOneModelGetParams {
+    pub person: models::Person
+}
+
+
+/// struct for typed successes of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetSuccess {
+    Status200(String),
+    UnknownValue(serde_json::Value),
+}
 
 /// struct for typed successes of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -39,6 +53,13 @@ pub enum TestsTypeTestingGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -61,6 +82,32 @@ pub enum TestsTypeTestingGetError {
 }
 
 
+pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Configuration, params: TestsAllOfWithOneModelGetParams) -> Result<ResponseContent<TestsAllOfWithOneModelGetSuccess>, Error<TestsAllOfWithOneModelGetError>> {
+
+    let uri_str = format!("{}/tests/allOfWithOneModel", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&params.person);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_discriminator_duplicate_enums_get(configuration: &configuration::Configuration) -> Result<ResponseContent<TestsDiscriminatorDuplicateEnumsGetSuccess>, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
 
     let uri_str = format!("{}/tests/discriminatorDuplicateEnums", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-async/README.md b/samples/client/petstore/rust/reqwest/petstore-async/README.md
index 6e3a6c7620f..515d5641216 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs
index 39951422299..a6ac53846f2 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs
@@ -14,6 +14,20 @@ use serde::{Deserialize, Serialize, de::Error as _};
 use crate::{apis::ResponseContent, models};
 use super::{Error, configuration, ContentType};
 
+/// struct for passing parameters to the method [`tests_all_of_with_one_model_get`]
+#[derive(Clone, Debug)]
+pub struct TestsAllOfWithOneModelGetParams {
+    pub person: models::Person
+}
+
+
+/// struct for typed successes of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetSuccess {
+    Status200(String),
+    UnknownValue(serde_json::Value),
+}
 
 /// struct for typed successes of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -39,6 +53,13 @@ pub enum TestsTypeTestingGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -61,6 +82,32 @@ pub enum TestsTypeTestingGetError {
 }
 
 
+pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Configuration, params: TestsAllOfWithOneModelGetParams) -> Result<ResponseContent<TestsAllOfWithOneModelGetSuccess>, Error<TestsAllOfWithOneModelGetError>> {
+
+    let uri_str = format!("{}/tests/allOfWithOneModel", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&params.person);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_discriminator_duplicate_enums_get(configuration: &configuration::Configuration) -> Result<ResponseContent<TestsDiscriminatorDuplicateEnumsGetSuccess>, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
 
     let uri_str = format!("{}/tests/discriminatorDuplicateEnums", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md b/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md
index 8ccbf8122a7..31c136905c0 100644
--- a/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs
index 39951422299..a6ac53846f2 100644
--- a/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs
@@ -14,6 +14,20 @@ use serde::{Deserialize, Serialize, de::Error as _};
 use crate::{apis::ResponseContent, models};
 use super::{Error, configuration, ContentType};
 
+/// struct for passing parameters to the method [`tests_all_of_with_one_model_get`]
+#[derive(Clone, Debug)]
+pub struct TestsAllOfWithOneModelGetParams {
+    pub person: models::Person
+}
+
+
+/// struct for typed successes of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetSuccess {
+    Status200(String),
+    UnknownValue(serde_json::Value),
+}
 
 /// struct for typed successes of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -39,6 +53,13 @@ pub enum TestsTypeTestingGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -61,6 +82,32 @@ pub enum TestsTypeTestingGetError {
 }
 
 
+pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Configuration, params: TestsAllOfWithOneModelGetParams) -> Result<ResponseContent<TestsAllOfWithOneModelGetSuccess>, Error<TestsAllOfWithOneModelGetError>> {
+
+    let uri_str = format!("{}/tests/allOfWithOneModel", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&params.person);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_discriminator_duplicate_enums_get(configuration: &configuration::Configuration) -> Result<ResponseContent<TestsDiscriminatorDuplicateEnumsGetSuccess>, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
 
     let uri_str = format!("{}/tests/discriminatorDuplicateEnums", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md
index 4cf403be230..9ee940fa0bd 100644
--- a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs
index ec77bc31852..448ed8a143c 100644
--- a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs
@@ -15,6 +15,13 @@ use crate::{apis::ResponseContent, models};
 use super::{Error, configuration, ContentType};
 
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -37,6 +44,43 @@ pub enum TestsTypeTestingGetError {
 }
 
 
+pub fn tests_all_of_with_one_model_get(configuration: &configuration::Configuration, person: models::Person) -> Result<String, Error<TestsAllOfWithOneModelGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_person = person;
+
+    let uri_str = format!("{}/tests/allOfWithOneModel", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&p_person);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req)?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text()?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `String`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `String`")))),
+        }
+    } else {
+        let content = resp.text()?;
+        let entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub fn tests_discriminator_duplicate_enums_get(configuration: &configuration::Configuration, ) -> Result<models::TestsDiscriminatorDuplicateEnumsGet200Response, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
 
     let uri_str = format!("{}/tests/discriminatorDuplicateEnums", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md
index 3761429a30a..7f4ea765bf7 100644
--- a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md
index b977e72b885..27c0de6b57e 100644
--- a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(foo_person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**foo_person** | [**FooPerson**](FooPerson.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::FooTestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs
index d8a822536bd..24b370c6d15 100644
--- a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs
@@ -15,6 +15,13 @@ use crate::{apis::ResponseContent, models};
 use super::{Error, configuration, ContentType};
 
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -37,6 +44,43 @@ pub enum TestsTypeTestingGetError {
 }
 
 
+pub fn tests_all_of_with_one_model_get(configuration: &configuration::Configuration, foo_person: models::FooPerson) -> Result<String, Error<TestsAllOfWithOneModelGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_foo_person = foo_person;
+
+    let uri_str = format!("{}/tests/allOfWithOneModel", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&p_foo_person);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req)?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text()?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `String`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `String`")))),
+        }
+    } else {
+        let content = resp.text()?;
+        let entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub fn tests_discriminator_duplicate_enums_get(configuration: &configuration::Configuration, ) -> Result<models::FooTestsDiscriminatorDuplicateEnumsGet200Response, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
 
     let uri_str = format!("{}/tests/discriminatorDuplicateEnums", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore/README.md b/samples/client/petstore/rust/reqwest/petstore/README.md
index 9d7acf5037d..f9c2b616164 100644
--- a/samples/client/petstore/rust/reqwest/petstore/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore/README.md
@@ -39,6 +39,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_inventory**](docs/StoreApi.md#get_inventory) | **GET** /store/inventory | Returns pet inventories by status
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
+*TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 *TestingApi* | [**tests_discriminator_duplicate_enums_get**](docs/TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_type_testing_get**](docs/TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
diff --git a/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md
index 1d26ae8655d..5439986dd2b 100644
--- a/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md
@@ -4,12 +4,41 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
 [**tests_discriminator_duplicate_enums_get**](TestingApi.md#tests_discriminator_duplicate_enums_get) | **GET** /tests/discriminatorDuplicateEnums | Test for duplicate enums when using discriminator. (One of the issues in #20500)
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_type_testing_get**](TestingApi.md#tests_type_testing_get) | **GET** /tests/typeTesting | Route to test the TypeTesting schema
 
 
 
+## tests_all_of_with_one_model_get
+
+> String tests_all_of_with_one_model_get(person)
+Test for allOf with a single option. (One of the issues in #20500)
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**person** | [**Person**](Person.md) |  | [required] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_discriminator_duplicate_enums_get
 
 > models::TestsDiscriminatorDuplicateEnumsGet200Response tests_discriminator_duplicate_enums_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs
index ec77bc31852..448ed8a143c 100644
--- a/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs
@@ -15,6 +15,13 @@ use crate::{apis::ResponseContent, models};
 use super::{Error, configuration, ContentType};
 
 
+/// struct for typed errors of method [`tests_all_of_with_one_model_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsAllOfWithOneModelGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_discriminator_duplicate_enums_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -37,6 +44,43 @@ pub enum TestsTypeTestingGetError {
 }
 
 
+pub fn tests_all_of_with_one_model_get(configuration: &configuration::Configuration, person: models::Person) -> Result<String, Error<TestsAllOfWithOneModelGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_person = person;
+
+    let uri_str = format!("{}/tests/allOfWithOneModel", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&p_person);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req)?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text()?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `String`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `String`")))),
+        }
+    } else {
+        let content = resp.text()?;
+        let entity: Option<TestsAllOfWithOneModelGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub fn tests_discriminator_duplicate_enums_get(configuration: &configuration::Configuration, ) -> Result<models::TestsDiscriminatorDuplicateEnumsGet200Response, Error<TestsDiscriminatorDuplicateEnumsGetError>> {
 
     let uri_str = format!("{}/tests/discriminatorDuplicateEnums", configuration.base_path);