Fix exploded query parameters with array property (#13656)

modules/openapi-generator/src/main/resources/Java/libraries/native/api.mustache

@@ -336,7 +336,12 @@ public class {{classname}} {
             {{#isExplode}}
                 {{#hasVars}}
                     {{#vars}}
+                        {{#isArray}}
+    localVarQueryParams.addAll(ApiClient.parameterToPairs("multi", "{{baseName}}", {{paramName}}.{{getter}}()));
+                        {{/isArray}}
+                        {{^isArray}}
     localVarQueryParams.addAll(ApiClient.parameterToPairs("{{baseName}}", {{paramName}}.{{getter}}()));
+                        {{/isArray}}
                     {{/vars}}
                 {{/hasVars}}
                 {{^hasVars}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java

@@ -17,10 +17,41 @@
 
 package org.openapitools.codegen.java;
 
-import static org.openapitools.codegen.TestUtils.validateJavaSourceFiles;
+import com.google.common.collect.ImmutableMap;
-import static org.testng.Assert.assertEquals;
+import io.swagger.v3.oas.models.OpenAPI;
-import static org.testng.Assert.assertTrue;
+import io.swagger.v3.oas.models.Operation;
-import static org.testng.Assert.fail;
+import io.swagger.v3.oas.models.media.ArraySchema;
+import io.swagger.v3.oas.models.media.ComposedSchema;
+import io.swagger.v3.oas.models.media.Content;
+import io.swagger.v3.oas.models.media.IntegerSchema;
+import io.swagger.v3.oas.models.media.MediaType;
+import io.swagger.v3.oas.models.media.ObjectSchema;
+import io.swagger.v3.oas.models.media.Schema;
+import io.swagger.v3.oas.models.media.StringSchema;
+import io.swagger.v3.oas.models.parameters.RequestBody;
+import io.swagger.v3.oas.models.responses.ApiResponse;
+import io.swagger.v3.parser.util.SchemaTypeUtil;
+import org.openapitools.codegen.ClientOptInput;
+import org.openapitools.codegen.CodegenConstants;
+import org.openapitools.codegen.CodegenModel;
+import org.openapitools.codegen.CodegenOperation;
+import org.openapitools.codegen.CodegenParameter;
+import org.openapitools.codegen.CodegenProperty;
+import org.openapitools.codegen.CodegenResponse;
+import org.openapitools.codegen.CodegenSecurity;
+import org.openapitools.codegen.DefaultGenerator;
+import org.openapitools.codegen.TestUtils;
+import org.openapitools.codegen.config.CodegenConfigurator;
+import org.openapitools.codegen.java.assertions.JavaFileAssert;
+import org.openapitools.codegen.languages.AbstractJavaCodegen;
+import org.openapitools.codegen.languages.JavaClientCodegen;
+import org.openapitools.codegen.languages.features.BeanValidationFeatures;
+import org.openapitools.codegen.languages.features.CXFServerFeatures;
+import org.openapitools.codegen.model.OperationMap;
+import org.openapitools.codegen.model.OperationsMap;
+import org.testng.Assert;
+import org.testng.annotations.Ignore;
+import org.testng.annotations.Test;
 
 import java.io.File;
 import java.io.IOException;
@@ -44,42 +75,10 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
-import org.openapitools.codegen.ClientOptInput;
+import static org.openapitools.codegen.TestUtils.validateJavaSourceFiles;
-import org.openapitools.codegen.CodegenConstants;
+import static org.testng.Assert.assertEquals;
-import org.openapitools.codegen.CodegenModel;
+import static org.testng.Assert.assertTrue;
-import org.openapitools.codegen.CodegenOperation;
+import static org.testng.Assert.fail;
-import org.openapitools.codegen.CodegenParameter;
-import org.openapitools.codegen.CodegenProperty;
-import org.openapitools.codegen.CodegenResponse;
-import org.openapitools.codegen.CodegenSecurity;
-import org.openapitools.codegen.DefaultGenerator;
-import org.openapitools.codegen.TestUtils;
-import org.openapitools.codegen.config.CodegenConfigurator;
-import org.openapitools.codegen.java.assertions.JavaFileAssert;
-import org.openapitools.codegen.languages.AbstractJavaCodegen;
-import org.openapitools.codegen.languages.JavaClientCodegen;
-import org.openapitools.codegen.languages.features.BeanValidationFeatures;
-import org.openapitools.codegen.languages.features.CXFServerFeatures;
-import org.openapitools.codegen.model.OperationMap;
-import org.openapitools.codegen.model.OperationsMap;
-import org.testng.Assert;
-import org.testng.annotations.Ignore;
-import org.testng.annotations.Test;
-
-import com.google.common.collect.ImmutableMap;
-import io.swagger.v3.oas.models.OpenAPI;
-import io.swagger.v3.oas.models.Operation;
-import io.swagger.v3.oas.models.media.ArraySchema;
-import io.swagger.v3.oas.models.media.ComposedSchema;
-import io.swagger.v3.oas.models.media.Content;
-import io.swagger.v3.oas.models.media.IntegerSchema;
-import io.swagger.v3.oas.models.media.MediaType;
-import io.swagger.v3.oas.models.media.ObjectSchema;
-import io.swagger.v3.oas.models.media.Schema;
-import io.swagger.v3.oas.models.media.StringSchema;
-import io.swagger.v3.oas.models.parameters.RequestBody;
-import io.swagger.v3.oas.models.responses.ApiResponse;
-import io.swagger.v3.parser.util.SchemaTypeUtil;
 
 public class JavaClientCodegenTest {
 
@@ -1665,4 +1664,28 @@ public class JavaClientCodegenTest {
                     .assertParameterAnnotations()
                     .containsWithName("NotNull");
     }
+
+    @Test
+    public void testNativeClientExplodedQueryParamWithArrayProperty() throws IOException {
+        Map<String, Object> properties = new HashMap<>();
+        properties.put(CodegenConstants.API_PACKAGE, "xyz.abcdef.api");
+
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+            .setGeneratorName("java")
+            .setLibrary(JavaClientCodegen.NATIVE)
+            .setAdditionalProperties(properties)
+            .setInputSpec("src/test/resources/3_0/exploded-query-param-array.yaml")
+            .setOutputDir(output.getAbsolutePath().replace("\\", "/"));
+
+        final ClientOptInput clientOptInput = configurator.toClientOptInput();
+        DefaultGenerator generator = new DefaultGenerator();
+        generator.opts(clientOptInput).generate();
+
+        TestUtils.assertFileContains(Paths.get(output + "/src/main/java/xyz/abcdef/api/DefaultApi.java"),
+            "localVarQueryParams.addAll(ApiClient.parameterToPairs(\"multi\", \"values\", queryObject.getValues()));"
+        );
+    }
 }

modules/openapi-generator/src/test/resources/3_0/exploded-query-param-array.yaml

@@ -0,0 +1,41 @@
+openapi: 3.0.3
+info:
+  title: Exploded query param array
+  description: "Exploded query params"
+  version: "1.0.0"
+servers:
+  - url: localhost:8080
+paths:
+  /api:
+    get:
+      operationId: GetSomeValue
+      parameters:
+      - in: query
+        name: QueryObject
+        explode: true
+        style: form
+        schema:
+          type: object
+          properties:
+            values:
+                type: array
+                items:
+                    type: string
+      responses:
+        '200':
+          description: Some return value
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SomeReturnValue'
+              example:
+                someValue: value
+components:
+  schemas:
+    SomeReturnValue:
+      type: object
+      required:
+        - someValue
+      properties:
+        someValue:
+          type: string