Overwrite Interface with specific type in response annotation

[katexochen]

Problem statement

I am trying to annotate an existing API in JSend style. The following struct represents the structure of every API response:

package server
type GeneralResponse struct {
	Status  string      `json:"status"`
	Data    interface{} `json:"data"`
	Message string      `json:"message,omitempty"` // only used when status = "error"
}

Handlers return this struct with a specific stuct in the Data interface, e.g., the getStatus handler retruns a GeneralResponse with a StatusResp as Data:

package server
type StatusResp struct {
	StatusCode int
	StatusMessage string
}

How can I annotate my code in such a way, that the model of my response is a GeneralResponse containing a StatusResp?
Swaggo/swag let you overwrite the interface with a specific type. Is there a way to do something similar for go-swagger?

There are some related Issues: #619, #1708
In #619 (comment), @casualjim suggests to have a look at the allOf and discriminated functions, but as far as I understood those, they are not solving this problem, since I don't want multiple possible values of Data, but one specific.

This is my current state:

// swagger:route GET /status status statusGet
//
// ...
//
//     Responses:
//       200: StatusResponse

// swagger:response StatusResponse
type StatusResponse struct {
	// in:body
	Body struct {
		// example: success
		Status string
		Data   server.StatusResp
	}
}

This is close to what I want, but has the following problems:

• The response does not have the GeneralResponse type/model
• I would have to rewrite this for every response

It would be nice to do it like this:

// swagger:route GET /status status statusGet
//
// ...
//
//     Responses:
//       200: body:GeneralResponse{Data: StatusResponse}

Environment

swagger version: v0.27.0
go version: 1.14
OS: Ubuntu 18.04 LTS

[katexochen]

The resulting Spec should look somewhat like this:

      responses:
        "200":
          description: OK
          schema:
            allOf:
            - $ref: '#/definitions/server.GeneralResponse'
            - properties:
                data:
                  $ref: '#/definitions/server.StatusResp'
              type: object