[BUG] [typescript-fetch] serialize/deserialze not working with inheritence

Created by: stephanpelikan

Description

Properties of super-classes are not serialized/deserialized.

openapi-generator version

4.1.0

OpenAPI declaration file content or url

components:
  schemas:
    Type:
      type: string
      enum:
      - B
    A:
      type: object
      discriminator:
        propertyName: type
      required:
      - type
      properties:
        whatever-a:
          type: string
        type:
          $ref: "#/components/schemas/Type"
    B:
      allOf:
        - $ref: "#/components/schemas/A"
        - type: object
          discriminator:
            propertyName: type
          properties:
            whatever-b:
              type: string

Suggest a fix

in modelGeneric.mustache add the lines with comment:

export function {{classname}}FromJSON(json: any): {{classname}} {
    {{#hasVars}}
    return {
        {{#parent}}...{{{parent}}}FromJSON(json),{{/parent}}  // deserialize inherited properties as well
        {{#additionalPropertiesType}}
            ...json,
        {{/additionalPropertiesType}}

and

export function {{classname}}ToJSON(value?: {{classname}}): any {
    {{#hasVars}}
    if (value === undefined) {
        return undefined;
    }
    return {
        {{#parent}}...{{{parent}}}ToJSON(value),{{/parent}}     // serialize inherited properties as well
        {{#additionalPropertiesType}}
            ...value,
        {{/additionalPropertiesType}}