Fix wrong import statements in dart-dio when using import-mappings

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultGenerator.java

@@ -570,6 +570,20 @@ void generateModels(List<File> files, List<ModelMap> allModels, List<String> unu
                     allModels.add(modelTemplate);
                 }
 
+                // Don't generate model files for types that were explicitly type-mapped
+                // AND whose mapped name has a corresponding import mapping.
+                // This indicates the user wants to replace the schema type with an
+                // external type (e.g. --type-mappings Address=CustomAddress
+                // --import-mappings CustomAddress=package:custom/address.dart).
+                // The model metadata is still kept in allModels for use by supporting file templates.
+                if (config.typeMapping().containsKey(modelName)) {
+                    String mappedTypeName = config.typeMapping().get(modelName);
+                    if (config.importMapping().containsKey(mappedTypeName)) {
+                        LOGGER.info("Model {} (type-mapped to {}) not generated due to import mapping", modelName, mappedTypeName);
+                        continue;
+                    }
+                }
+
                 // to generate model files
                 generateModel(files, models, modelName);
 

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioClientCodegen.java

@@ -617,6 +617,18 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
                 CodegenModel cm = mo.getModel();
                 cm.imports = rewriteImports(cm.imports, true);
                 cm.vendorExtensions.put("x-has-vars", !cm.vars.isEmpty());
+
+                // Check if this model's classname has an import mapping.
+                // If so, mark it so that supporting file templates (serializers, barrel)
+                // can use the mapped import path instead of the default model/ path.
+                if (importMapping().containsKey(cm.classname)) {
+                    cm.vendorExtensions.put("x-is-import-mapped", true);
+                    cm.vendorExtensions.put("x-import-path", importMapping().get(cm.classname));
+                } else {
+                    cm.vendorExtensions.put("x-is-import-mapped", false);
+                    cm.vendorExtensions.put("x-import-path",
+                            "package:" + pubName + "/" + sourceFolder + "/" + modelPackage() + "/" + cm.classFilename + ".dart");
+                }
             }
         }
 

modules/openapi-generator/src/main/resources/dart/libraries/dio/lib.mustache

@@ -9,5 +9,5 @@ export 'package:{{pubName}}/{{sourceFolder}}/auth/oauth.dart';
 
 {{#apiInfo}}{{#apis}}export 'package:{{pubName}}/{{sourceFolder}}/{{apiPackage}}/{{classFilename}}.dart';
 {{/apis}}{{/apiInfo}}
-{{#models}}{{#model}}export 'package:{{pubName}}/{{sourceFolder}}/{{modelPackage}}/{{classFilename}}.dart';
+{{#models}}{{#model}}export '{{{vendorExtensions.x-import-path}}}';
 {{/model}}{{/models}}

modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/serializers.mustache

@@ -12,7 +12,7 @@ import 'package:{{pubName}}/{{sourceFolder}}/date_serializer.dart';
 import 'package:{{pubName}}/{{sourceFolder}}/{{modelPackage}}/date.dart';{{/useDateLibCore}}
 {{#useDateLibTimeMachine}}import 'package:time_machine/time_machine.dart';
 import 'package:{{pubName}}/{{sourceFolder}}/offset_date_serializer.dart';{{/useDateLibTimeMachine}}
-{{#models}}{{#model}}import 'package:{{pubName}}/{{sourceFolder}}/{{modelPackage}}/{{classFilename}}.dart';
+{{#models}}{{#model}}import '{{{vendorExtensions.x-import-path}}}';
 {{/model}}{{/models}}{{#builtValueSerializerImports}}import '{{{.}}}';
 {{/builtValueSerializerImports}}
 

modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/json_serializable/deserialize.mustache

@@ -1,7 +1,7 @@
 {{#models}}
   {{#model}}
   {{^isEnum}}
-import 'package:{{pubName}}/{{sourceFolder}}/{{modelPackage}}/{{classFilename}}.dart';
+import '{{{vendorExtensions.x-import-path}}}';
 {{/isEnum}}
 {{/model}}
 {{/models}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/dart/dio/DartDioClientCodegenTest.java

@@ -25,6 +25,7 @@
 import java.io.*;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
@@ -93,6 +94,54 @@ public void testKeywords() {
         }
     }
 
+    @Test
+    public void testImportMappingsInSerializersAndBarrelFile() throws IOException {
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final String pubName = "my_api";
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("dart-dio")
+                .setGitUserId("my-user")
+                .setGitRepoId("my-repo")
+                .setInputSpec("src/test/resources/3_0/dart-dio/import_mapping.yaml")
+                .setOutputDir(output.getAbsolutePath().replace("\\", "/"));
+
+        configurator.addAdditionalProperty("pubName", pubName);
+        configurator.addTypeMapping("Address", "CustomAddress");
+        configurator.addImportMapping("CustomAddress", "package:my_api/src/custom_models/custom_address.dart");
+
+        ClientOptInput opts = configurator.toClientOptInput();
+
+        Generator generator = new DefaultGenerator().opts(opts);
+        List<File> files = generator.generate();
+        files.forEach(File::deleteOnExit);
+
+        // The model file for the mapped type should NOT be generated
+        TestUtils.assertFileNotExists(output.toPath().resolve("lib/src/model/custom_address.dart"));
+
+        // order_out.dart should use the custom import path (this already works per the issue report)
+        Path orderOutPath = output.toPath().resolve("lib/src/model/order_out.dart");
+        TestUtils.assertFileContains(orderOutPath,
+                "package:my_api/src/custom_models/custom_address.dart");
+        TestUtils.assertFileNotContains(orderOutPath,
+                "package:my_api/src/model/custom_address.dart");
+
+        // serializers.dart should use the custom import path, not the hardcoded model/ path
+        Path serializersPath = output.toPath().resolve("lib/src/serializers.dart");
+        TestUtils.assertFileContains(serializersPath,
+                "package:my_api/src/custom_models/custom_address.dart");
+        TestUtils.assertFileNotContains(serializersPath,
+                "package:my_api/src/model/custom_address.dart");
+
+        // The barrel file should use the custom export path, not the hardcoded model/ path
+        Path barrelPath = output.toPath().resolve("lib/my_api.dart");
+        TestUtils.assertFileContains(barrelPath,
+                "package:my_api/src/custom_models/custom_address.dart");
+        TestUtils.assertFileNotContains(barrelPath,
+                "package:my_api/src/model/custom_address.dart");
+    }
+
     @Test
     public void verifyDartDioGeneratorRuns() throws IOException {
         File output = Files.createTempDirectory("test").toFile();

modules/openapi-generator/src/test/resources/3_0/dart-dio/import_mapping.yaml

@@ -0,0 +1,33 @@
+openapi: "3.1.0"
+info:
+  title: Example
+  version: "1.0.0"
+paths:
+  /orders:
+    get:
+      operationId: getOrders
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/OrderOut"
+components:
+  schemas:
+    Address:
+      type: object
+      required: [street, city]
+      properties:
+        street:
+          type: string
+        city:
+          type: string
+    OrderOut:
+      type: object
+      required: [id, shippingAddress]
+      properties:
+        id:
+          type: integer
+        shippingAddress:
+          $ref: "#/components/schemas/Address"