#21582 [BUG][dart-dio] Bug generating inline enums with common names

Author: tomcra

bin/configs/dart-dio-enum-property-name.yaml

@@ -0,0 +1,8 @@
+generatorName: dart-dio
+outputDir: samples/openapi3/client/bug-samples/issue_21582
+inputSpec: modules/openapi-generator/src/test/resources/bugs/issues_21582.yaml
+templateDir: modules/openapi-generator/src/main/resources/dart/libraries/dio
+additionalProperties:
+  hideGenerationTimestamp: "true"
+  enumUnknownDefaultCase: "true"
+  dateLibrary: "core"

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

@@ -577,6 +577,12 @@ public void postProcessModelProperty(CodegenModel model, CodegenProperty propert
                 // inner items e.g. enums in collections, only works for one level
                 // but same is the case for DefaultCodegen
                 property.setDatatypeWithEnum(property.datatypeWithEnum.replace(property.items.datatypeWithEnum, enumName));
+                // Because properties are cached in org.openapitools.codegen.DefaultCodegen.fromProperty(java.lang.String, io.swagger.v3.oas.models.media.Schema, boolean, boolean)
+                // then the same object could be for multiple properties where the name of the inline enum is the same
+                // in 2 different classes and the following renaming will impact properties in other classes we
+                // therefore clone them before editing
+                property.items = property.items.clone();
+                property.mostInnerItems = property.items;
                 property.items.setDatatypeWithEnum(enumName);
                 property.items.setEnumName(enumName);
             } else {

modules/openapi-generator/src/test/resources/bugs/issues_21582.yaml

@@ -0,0 +1,52 @@
+openapi: "3.0.3"
+info:
+  version: 1.0.0
+  title: test
+paths:
+  /test:
+    get:
+      summary: test
+      operationId: test
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ObjectThree'
+components:
+  schemas:
+    ObjectOne:
+      type: object
+      properties:
+        attribute:
+          description: 'Object one attribute enum'
+          type: 'array'
+          uniqueItems: true
+          items:
+            type: 'string'
+            enum: [
+              'valueone',
+              'vauetwo'
+            ]
+    ObjectTwo:
+      type: object
+      properties:
+        attribute:
+          description: 'Object two attribute enum'
+          type: 'array'
+          uniqueItems: true
+          items:
+            type: 'string'
+            enum: [
+              'valueone',
+              'vauetwo'
+            ]
+    ObjectThree:
+      type: object
+      properties:
+        objectone:
+          $ref: '#/components/schemas/ObjectOne'
+        objecttwo:
+          $ref: '#/components/schemas/ObjectTwo'
+