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1030 - DifferentDiscriminator

Description: Checks whether value of discriminator has changed from the previous specification.

Cause: This is considered a breaking change.

Example: Value of discriminator element of Parameter Pet changed from petType to name in the new version.

Old specification

{
  "swagger": "2.0",
  "info": {
    "title": "swagger",
    "description": "The Azure Management API.",
    "version": "2016-12-01",
    ...
    ...
  "definitions": {
    ...
    "Pet": {
      "type": "object",
      "discriminator": "petType",
      "properties": {
        "name": {
          "type": "string"
        },
        "petType": {
          "type": "string"
        }
      },
      "required": [
        "name",
        "petType"
      ]
    },
    ...  

New specification

{
  "swagger": "2.0",
  "info": {
    "title": "swagger",
    "description": "The Azure Management API.",
    "version": "2016-12-01",
    ...
    ...
  "definitions": {
    ...
    "Pet": {
      "type": "object",
      "discriminator": "name",
      "properties": {
        "name": {
          "type": "string"
        },
        "petType": {
          "type": "string"
        }
      },
      "required": [
        "name",
        "petType"
      ]
    },
    ...