[DART-dio] Can't send body and binary data

Created by: jaumard

I have the following definition:

"/api/v1/shops/{shop_id}/transactions/{id}/signature":
    patch:
      operationId: patch_shops_transaction_signature_partial
      description: ""
      requestBody:
        content:
          image/png:
            schema:
              type: string
              nullable: true
              format: binary
        description: signature image to upload
        required: true
      responses:
        "201":
          description: All good
      tags:
        - transactions

This is generated like this:

Future<Response<void>> patchShopsTransactionSignaturePartial(
    int id,
    int shopId,
    Uint8List body, { 
    CancelToken cancelToken,
    Map<String, dynamic> headers,
    Map<String, dynamic> extra,
    ValidateStatus validateStatus,
    ProgressCallback onSendProgress,
    ProgressCallback onReceiveProgress,
  }) async {
    final _request = RequestOptions(
      path: r'/api/v1/shops/{shop_id}/transactions/{id}/signature'.replaceAll('{' r'id' '}', id.toString()).replaceAll('{' r'shop_id' '}', shopId.toString()),
      method: 'PATCH',
      headers: <String, dynamic>{
        ...?headers,
      },
      extra: <String, dynamic>{
        'secure': <Map<String, String>>[
          {
            'type': 'apiKey',
            'name': 'Bearer',
            'keyName': 'Authorization',
            'where': 'header',
          },
        ],
        ...?extra,
      },
      validateStatus: validateStatus,
      contentType: [
        'image/png',
      ].first,
      cancelToken: cancelToken,
      onSendProgress: onSendProgress,
      onReceiveProgress: onReceiveProgress,
    );

    dynamic _bodyData;

    _bodyData = body;

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

    return _response;
  }

But this is not working, the correct way of sending the data is like this according to this issue of dio (https://github.com/flutterchina/dio/issues/1036):

Future<Response<void>> patchShopsTransactionSignaturePartial(
      int id,
      int shopId,
      Uint8List body, {
        CancelToken cancelToken,
        Map<String, dynamic> headers,
        Map<String, dynamic> extra,
        ValidateStatus validateStatus,
        ProgressCallback onSendProgress,
        ProgressCallback onReceiveProgress,
      }) async {
    final _request = RequestOptions(
      path: r'/api/v1/shops/{shop_id}/transactions/{id}/signature'.replaceAll('{' r'id' '}', id.toString()).replaceAll('{' r'shop_id' '}', shopId.toString()),
      method: 'PATCH',
      headers: <String, dynamic>{
        ...?headers,
        'Content-length': body.length,
      },
      extra: <String, dynamic>{
        'secure': <Map<String, String>>[
          {
            'type': 'apiKey',
            'name': 'Bearer',
            'keyName': 'Authorization',
            'where': 'header',
          },
        ],
        ...?extra,
      },
      validateStatus: validateStatus,
      contentType: [
        'application/octet-stream',
      ].first,
      cancelToken: cancelToken,
      onSendProgress: onSendProgress,
      onReceiveProgress: onReceiveProgress,
    );

    List<int> _bodyData;

    _bodyData = body;

    final _response = await _dio.request<dynamic>(
      _request.path,
      data: Stream.fromIterable(_bodyData.map((e) => [e])),
      options: _request,
    );

    return _response;
  }