diff --git a/samples/client/petstore/ruby-autoload/lib/petstore/models/all_of_with_single_ref.rb b/samples/client/petstore/ruby-autoload/lib/petstore/models/all_of_with_single_ref.rb
index 4efc82eac4a..89884ca12b0 100644
--- a/samples/client/petstore/ruby-autoload/lib/petstore/models/all_of_with_single_ref.rb
+++ b/samples/client/petstore/ruby-autoload/lib/petstore/models/all_of_with_single_ref.rb
@@ -43,7 +43,6 @@ module Petstore
     # List of attributes with nullable: true
     def self.openapi_nullable
       Set.new([
-        :'single_ref_type'
       ])
     end
 
diff --git a/samples/client/petstore/rust/hyper/petstore/docs/ActionContainer.md b/samples/client/petstore/rust/hyper/petstore/docs/ActionContainer.md
index d705faa58f2..8490ec5d821 100644
--- a/samples/client/petstore/rust/hyper/petstore/docs/ActionContainer.md
+++ b/samples/client/petstore/rust/hyper/petstore/docs/ActionContainer.md
@@ -4,7 +4,7 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**action** | Option<[**crate::models::Baz**](Baz.md)> |  | 
+**action** | [**crate::models::Baz**](Baz.md) |  | 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/rust/hyper/petstore/src/models/action_container.rs b/samples/client/petstore/rust/hyper/petstore/src/models/action_container.rs
index b63126c05e9..32d925eed3d 100644
--- a/samples/client/petstore/rust/hyper/petstore/src/models/action_container.rs
+++ b/samples/client/petstore/rust/hyper/petstore/src/models/action_container.rs
@@ -14,13 +14,13 @@
 #[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize)]
 pub struct ActionContainer {
     #[serde(rename = "action")]
-    pub action: Option<Box<crate::models::Baz>>,
+    pub action: Box<crate::models::Baz>,
 }
 
 impl ActionContainer {
-    pub fn new(action: Option<crate::models::Baz>) -> ActionContainer {
+    pub fn new(action: crate::models::Baz) -> ActionContainer {
         ActionContainer {
-            action: if let Some(x) = action {Some(Box::new(x))} else {None},
+            action: Box::new(action),
         }
     }
 }
diff --git a/samples/client/petstore/rust/reqwest/petstore/docs/ActionContainer.md b/samples/client/petstore/rust/reqwest/petstore/docs/ActionContainer.md
index d705faa58f2..8490ec5d821 100644
--- a/samples/client/petstore/rust/reqwest/petstore/docs/ActionContainer.md
+++ b/samples/client/petstore/rust/reqwest/petstore/docs/ActionContainer.md
@@ -4,7 +4,7 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**action** | Option<[**crate::models::Baz**](Baz.md)> |  | 
+**action** | [**crate::models::Baz**](Baz.md) |  | 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/rust/reqwest/petstore/src/models/action_container.rs b/samples/client/petstore/rust/reqwest/petstore/src/models/action_container.rs
index b63126c05e9..32d925eed3d 100644
--- a/samples/client/petstore/rust/reqwest/petstore/src/models/action_container.rs
+++ b/samples/client/petstore/rust/reqwest/petstore/src/models/action_container.rs
@@ -14,13 +14,13 @@
 #[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize)]
 pub struct ActionContainer {
     #[serde(rename = "action")]
-    pub action: Option<Box<crate::models::Baz>>,
+    pub action: Box<crate::models::Baz>,
 }
 
 impl ActionContainer {
-    pub fn new(action: Option<crate::models::Baz>) -> ActionContainer {
+    pub fn new(action: crate::models::Baz) -> ActionContainer {
         ActionContainer {
-            action: if let Some(x) = action {Some(Box::new(x))} else {None},
+            action: Box::new(action),
         }
     }
 }