[BUG][Dart] Generator creates a model class name that conflicts with a core lib class name (Type)

[robrbecker]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue? Yes:
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When generating Dart code, an OAS is using a reserved(ish) word (Type) which the generator defines a class for which then conflicts and causes errors. (It's not technically a reserved word of the language, it's a class in the core library. Something that's always available and you can't import it with a namespace)

openapi-generator version

5.1.0 release
on both dart-dio and dart-dio-next

OpenAPI declaration file content or url

https://cdn-prod.wdesk.com/endpoints-admin/1.342.0/openapi/platform-v1.yaml

Problem arises from line 813

Generation Details

I used the jar release for 5.1.0 with this command:
java -jar openapi-generator-cli.jar generate -i https://cdn-prod.wdesk.com/endpoints-admin/1.342.0/openapi/platform-v1.yaml -g dart-dio -o ./ --additional-properties="pubDescription=Workiva Platform API (Dart),pubName=wk,pubVersion=1.0.0"

Steps to reproduce

Generate Dart code with the above command.
Have Dart installed (2.12.2)
Then run
pub get
pub run build_runner build --delete-conflicting-outputs -o build
(then remove the build directory .. you only need to run a build to do built_value code generation
Then either open in an IDE with the Dart plugin (VS Code, intelliJ) or just run dartanalyzer . which will show the errors.

Related issues/PRs

Suggest a fix

I'm not actually sure what a good fix would be. I might actually prefer if generation failed when creating the code and suggested a way to work around it, possibly by using the [--reserved-words-mappings <reserved word mappings>...] option ?

[robrbecker]

So far, the only workaround I've found is to use
--model-name-suffix or --model-name-prefix
which changes the names of ALL model files, which is suboptimal.
I'd really prefer to just be able to remap the name of a single model. In this case something like:

--model-mapping="Type=RecordType"

[kuhnroyal]

I could add this to the reserved words, it is not optimal but we also did this for Request, Response and so on.

[kuhnroyal]

Actually we have this place where it should be added:

        // DataTypes of the above values which are automatically imported.
        // They are also not allowed to be model names.
        defaultIncludes = Sets.newHashSet(
                "String",
                "bool",
                "int",
                "num",
                "double",
                "dynamic",
                "List",
                "Set",
                "Map",
                "DateTime",
                "Object",
                "MultipartFile"
        );

[kuhnroyal]

Can you try running this with --type-mappings=Type=RecordType in the mean time.

[kuhnroyal]

I created a PR, would be great if you could test this with the --type-mappings=Type=RecordType parameter.

[robrbecker]

Oops I missed the earlier notification. Yes, let me give it a try.

[robrbecker]

@kuhnroyal I built and verified that #9167 works great to map Type to RecordType with --type-mappings=Type=RecordType !!
Works great for my use case, thanks!

[lam-nv]

Hi @kuhnroyal

I have an issue with imports in *_api.dart (generated by .templates/dart-dio/api.mustache), see details below:

.templates/dart-dio/api.mustache

{{>header}}
import 'dart:async';
import 'package:dio/dio.dart';
import 'package:built_value/serializer.dart';

{{#operations}}
{{#imports}}import '{{.}}';
{{/imports}}

class {{classname}} {

  final Dio _dio;

  final Serializers _serializers;

  const {{classname}}(this._dio, this._serializers);

  {{#operation}}
  /// {{{summary}}}
  ///
  /// {{{notes}}}
  Future<Response<{{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}>> {{nickname}}({{^hasRequiredParams}}{ {{/hasRequiredParams}}{{#requiredParams}}
    {{{dataType}}} {{paramName}},{{#-last}} { {{/-last}}{{/requiredParams}}{{#optionalParams}}
    {{{dataType}}} {{paramName}},{{/optionalParams}}
    CancelToken cancelToken,
    Map<String, dynamic> headers,
    Map<String, dynamic> extra,
    ValidateStatus validateStatus,
    ProgressCallback onSendProgress,
    ProgressCallback onReceiveProgress,
  }) async {
    final _request = RequestOptions(
      path: r'{{{path}}}'{{#pathParams}}.replaceAll('{' r'{{{baseName}}}' '}', {{{paramName}}}.toString()){{/pathParams}},
      method: '{{#lambda.uppercase}}{{httpMethod}}{{/lambda.uppercase}}',
      {{#isResponseFile}}
      responseType: ResponseType.bytes,
      {{/isResponseFile}}
      headers: <String, dynamic>{
        {{#httpUserAgent}}
        r'User-Agent': r'{{{.}}}',
        {{/httpUserAgent}}
        {{#headerParams}}
        {{^required}}{{^nullable}}if ({{{paramName}}} != null) {{/nullable}}{{/required}}r'{{baseName}}': {{paramName}},
        {{/headerParams}}
        ...?headers,
      },
      {{#hasQueryParams}}
      queryParameters: <String, dynamic>{
        {{#queryParams}}
        {{^required}}{{^nullable}}if ({{{paramName}}} != null) {{/nullable}}{{/required}}r'{{baseName}}': {{paramName}},
        {{/queryParams}}
      },
      {{/hasQueryParams}}
      extra: <String, dynamic>{
        'secure': <Map<String, String>>[{{^hasAuthMethods}}],{{/hasAuthMethods}}{{#hasAuthMethods}}
          {{#authMethods}}{
            'type': '{{type}}',
            'name': '{{name}}',{{#isApiKey}}
            'keyName': '{{keyParamName}}',
            'where': '{{#isKeyInQuery}}query{{/isKeyInQuery}}{{#isKeyInHeader}}header{{/isKeyInHeader}}',{{/isApiKey}}
          },{{/authMethods}}
        ],{{/hasAuthMethods}}
        ...?extra,
      },
      validateStatus: validateStatus,
      contentType: [{{^hasConsumes}}
        'application/json',{{/hasConsumes}}{{#hasConsumes}}{{#consumes}}
        '{{{mediaType}}}',{{/consumes}}{{/hasConsumes}}
      ].first,
      cancelToken: cancelToken,
      onSendProgress: onSendProgress,
      onReceiveProgress: onReceiveProgress,
    );

    dynamic _bodyData;
    {{#hasFormParams}}

    _bodyData = {{#isMultipart}}FormData.fromMap({{/isMultipart}}<String, dynamic>{
      {{#formParams}}
      {{^required}}{{^nullable}}if ({{{paramName}}} != null) {{/nullable}}{{/required}}r'{{{baseName}}}': {{#isFile}}MultipartFile.fromBytes({{{paramName}}}, filename: r'{{{baseName}}}'){{/isFile}}{{^isFile}}encodeFormParameter(_serializers, {{{paramName}}}, const FullType({{^isContainer}}{{{baseType}}}{{/isContainer}}{{#isContainer}}Built{{#isMap}}Map{{/isMap}}{{#isArray}}{{#uniqueItems}}Set{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}{{/isArray}}, [{{#isMap}}FullType(String), {{/isMap}}FullType({{{baseType}}})]{{/isContainer}})){{/isFile}},
      {{/formParams}}
    }{{#isMultipart}}){{/isMultipart}};
    {{/hasFormParams}}
    {{#bodyParam}}

    {{#isPrimitiveType}}
    _bodyData = {{paramName}};
    {{/isPrimitiveType}}
    {{^isPrimitiveType}}
    {{#isContainer}}
    const _type = FullType(Built{{#isMap}}Map{{/isMap}}{{#isArray}}{{#uniqueItems}}Set{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}{{/isArray}}, [{{#isMap}}FullType(String), {{/isMap}}FullType({{{baseType}}})]);
    _bodyData = _serializers.serialize({{paramName}}, specifiedType: _type);
    {{/isContainer}}
    {{^isContainer}}
    const _type = FullType({{{baseType}}});
    _bodyData = _serializers.serialize({{paramName}}, specifiedType: _type);
    {{/isContainer}}
    {{/isPrimitiveType}}
    {{/bodyParam}}

    final _response = await _dio.request<dynamic>(
      _request.path,
      data: _bodyData,
      options: _request,
    );
    {{#returnType}}

    {{#isResponseFile}}
    final {{{returnType}}} _responseData = _response.data as {{{returnType}}};
    {{/isResponseFile}}
    {{^isResponseFile}}
    {{#returnSimpleType}}
    {{#returnTypeIsPrimitive}}
    final {{{returnType}}} _responseData = _response.data as {{{returnType}}};
    {{/returnTypeIsPrimitive}}
    {{^returnTypeIsPrimitive}}
    const _responseType = FullType({{{returnType}}});
    final _responseData = _serializers.deserialize(
      _response.data,
      specifiedType: _responseType,
    ) as {{{returnType}}};
    {{/returnTypeIsPrimitive}}
    {{/returnSimpleType}}
    {{^returnSimpleType}}
    const _responseType = FullType(Built{{#isArray}}{{#uniqueItems}}Set{{/uniqueItems}}{{^uniqueItems}}List{{/uniqueItems}}{{/isArray}}{{#isMap}}Map{{/isMap}}, [{{#isMap}}FullType(String), {{/isMap}}FullType({{{returnBaseType}}})]);
    final {{{returnType}}} _responseData = _serializers.deserialize(
      _response.data,
      specifiedType: _responseType,
    ) as {{{returnType}}};
    {{/returnSimpleType}}
    {{/isResponseFile}}

    return Response<{{{returnType}}}>(
      data: _responseData,
      headers: _response.headers,
      isRedirect: _response.isRedirect,
      request: _response.request,
      redirects: _response.redirects,
      statusCode: _response.statusCode,
      statusMessage: _response.statusMessage,
      extra: _response.extra,
    );{{/returnType}}{{^returnType}}
    return _response;{{/returnType}}
  }

  {{/operation}}
}
{{/operations}}

*_api.dart

// ignore_for_file: unused_import

import 'dart:async';
import 'package:dio/dio.dart';
import 'package:built_value/serializer.dart';


import '{import=lib.model.Body, classname=Body}';
import '{import=lib.model.Body1, classname=Body1}';
import '{import=lib.model.Body10, classname=Body10}';
import '{import=lib.model.Body11, classname=Body11}';
import '{import=lib.model.Body12, classname=Body12}';
import '{import=lib.model.Body13, classname=Body13}';
import '{import=lib.model.Body15, classname=Body15}';
import '{import=lib.model.Body2, classname=Body2}';
import '{import=lib.model.Body3, classname=Body3}';
import '{import=lib.model.Body4, classname=Body4}';
import '{import=lib.model.Body5, classname=Body5}';
import '{import=lib.model.Body6, classname=Body6}';
import '{import=lib.model.Body7, classname=Body7}';
import '{import=lib.model.Body8, classname=Body8}';
import '{import=lib.model.Body9, classname=Body9}';
import '{import=lib.model.InlineResponse200, classname=InlineResponse200}';
import '{import=lib.model.InlineResponse2001, classname=InlineResponse2001}';
import '{import=lib.model.InlineResponse20010, classname=InlineResponse20010}';
import '{import=lib.model.InlineResponse20011, classname=InlineResponse20011}';
import '{import=lib.model.InlineResponse20012, classname=InlineResponse20012}';
import '{import=lib.model.InlineResponse20013, classname=InlineResponse20013}';
import '{import=lib.model.InlineResponse20015, classname=InlineResponse20015}';
import '{import=lib.model.InlineResponse2002, classname=InlineResponse2002}';
import '{import=lib.model.InlineResponse2003, classname=InlineResponse2003}';
import '{import=lib.model.InlineResponse2004, classname=InlineResponse2004}';
import '{import=lib.model.InlineResponse2005, classname=InlineResponse2005}';
import '{import=lib.model.InlineResponse2006, classname=InlineResponse2006}';
import '{import=lib.model.InlineResponse2007, classname=InlineResponse2007}';
import '{import=lib.model.InlineResponse2008, classname=InlineResponse2008}';
import '{import=lib.model.InlineResponse2009, classname=InlineResponse2009}';
import '{import=lib.model.InlineResponse503, classname=InlineResponse503}';

class AuthenticationApi {

  final Dio _dio;

  final Serializers _serializers;

config.yaml

generatorName: dart-dio
inputSpec: spec.yaml
outputFolder: .
templateDir: .templates/dart-dio
pubName: openapi
pubLibrary: openapi
useEnumExtension: true
serializationLibrary: built_value
additionalProperties:
  clientName: openApi
  serializableModel: "true"
  dateLibrary: core
  # # dateLibrary: timeMachine
  hideGenerationTimestamp: "true"
  useBuiltValue: "true"
typeMappings:
  Array: BuiltList
  array: BuiltList
  List: BuiltList
  set: BuiltSet
  map: BuiltMap
  file: Uint8List
  binary: Uint8List
  object: JsonObject
  AnyType: JsonObject
  Type: RecordType

generator version is 5.1.0

.Could you have a look? or help me correct it?

[kuhnroyal]

The changes from #9167 (which you are trying to use) have not been released yet. You need to build from master if you want to use this.

[lam-nv]

The changes from #9167 (which you are trying to use) have not been released yet. You need to build from master if you want to use this.

Hi @kuhnroyal,

I just checked with the build from master (5.1.1-SNAPSHOT), but it still the same result.

Kindly check with this statement:

{{#imports}}import '{{.}}';

Could you have a look?