FromForm Attribute and Spec Generation

[rodriciru]

Hi. Currently, if I have a Controller based openapi, and in some entry point the request comes from a [FromForm] attr: public async Task<IActionResult> Preguntar([FromForm] PeticionPregunta request),
the spec generated has not a $ref pointing to a PeticionPregunta schema. If fact, it won't exist. So this is what is generated:

"requestBody": {
          "content": {
            "multipart/form-data": {
              "schema": {
                "type": "object",
                "properties": {
                  "Pregunta": {
                    "type": "string"
                  },
                  "IdConversacion": {
                    "type": "string"
                  },
                  "Fichero": {
                    "$ref": "#/components/schemas/IFormFile"
                  },
                  "Proveedor": {
                    "type": "string"
                  },
                  "Modelo": {
                    "type": "string"
                  }
                }
              }
            }
          },
          "required": true

Raw fields instead to a $ref.
With this for example, Scalar prints the fields, but not desc, required, examples...., and some OpenAPI Generators won't create a typed response, because it won't exist.

I must say I fix that, modifying the resultant schema and adding a reference in that places, but I still think this is something that must be simpler than my solution.

Do you face the same problem?