Decorator APIProduces doesn't work

I’m submitting a Potential bug

[ ] Regression
[x] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request

Current behavior

I use nestjs/swagger with swagger-ui-express. I set the decorator @ApiProduces("text/csv") but nothing is displayed in Swagger-ui. I check the produced specs using F12 on Swagger-UI and nothing, in the specs, involved “Produces”.

Expected behavior

The user can choose the Content-Type of the Response in Swagger-UI. As shown on the image below. This image is generated with YAML.

The GET attribute has :

produces:
        - application/json
        - text/csv

Minimal reproduction of the problem with instructions

Insert this function in a controller.

@Get('thing')
@ApiProduces("text/csv")
// @ApiProduces("text/csv", "application/json")
public test(): any {
	return {
		id: "id",
		name: "name"
	};
}

Environment

Last version.

"@nestjs/common": "^6.7.2",
"@nestjs/config": "0.0.9",
"@nestjs/core": "^6.7.2",
"@nestjs/platform-express": "^6.7.2",
"@nestjs/swagger": "^4.4.0",
"swagger-ui-express": "^4.1.4"
 
For Tooling issues:
- Platform: Windows

[VaultDeveloper]

@zachgoll I found a way.

@Get(':id')
@ApiProduces("application/json", "application/vnd.api+json")
@ApiCreatedResponse({
	type: MyModel
})
public getModel(@Param('id') psModelId: string): MyModel {
	return {
		id: "123456789-12",
		body: ""
	};
}

MyModel is a classic Typescript class containing attribute id and body.

export class MyModel {
	@ApiProperty()
	id: string;

	@ApiProperty()
	body: string;
}

Result.

[CodalReef]

I made a tweak to make this work for Swagger 3 with the JS Codegen tool:

  @ApiProduces('image/png')
  @ApiResponse({
    status: 200,
    schema: {
      type: 'string',
      format: 'binary',
    },
  })

The Swagger JSON produced looks like this:

{
"responses":{"200":{"description":"","content":{"image/png":{"schema":{"type":"string","format":"binary"}}}}}
}

Which matches the Swagger 3 Docs for Binary Files: https://swagger.io/docs/specification/basic-structure/