Added $type to ReferenceResponseModels (#18293)

* Added $type to ReferenceResponseModels

* Updated OpenApi.json and client-side types.

---------

Co-authored-by: Andy Butland <abutland73@gmail.com>

src/Umbraco.Cms.Api.Management/OpenApi.json

@@ -36517,10 +36517,14 @@
       },
       "DefaultReferenceResponseModel": {
         "required": [
+          "$type",
           "id"
         ],
         "type": "object",
         "properties": {
+          "$type": {
+            "type": "string"
+          },
           "id": {
             "type": "string",
             "format": "uuid"
@@ -36538,7 +36542,13 @@
             "nullable": true
           }
         },
-        "additionalProperties": false
+        "additionalProperties": false,
+        "discriminator": {
+          "propertyName": "$type",
+          "mapping": {
+            "DefaultReferenceResponseModel": "#/components/schemas/DefaultReferenceResponseModel"
+          }
+        }
       },
       "DeleteUserGroupsRequestModel": {
         "required": [
@@ -37058,11 +37068,15 @@
       },
       "DocumentReferenceResponseModel": {
         "required": [
+          "$type",
           "documentType",
           "id"
         ],
         "type": "object",
         "properties": {
+          "$type": {
+            "type": "string"
+          },
           "id": {
             "type": "string",
             "format": "uuid"
@@ -37083,7 +37097,13 @@
             ]
           }
         },
-        "additionalProperties": false
+        "additionalProperties": false,
+        "discriminator": {
+          "propertyName": "$type",
+          "mapping": {
+            "DocumentReferenceResponseModel": "#/components/schemas/DocumentReferenceResponseModel"
+          }
+        }
       },
       "DocumentResponseModel": {
         "required": [
@@ -39191,11 +39211,15 @@
       },
       "MediaReferenceResponseModel": {
         "required": [
+          "$type",
           "id",
           "mediaType"
         ],
         "type": "object",
         "properties": {
+          "$type": {
+            "type": "string"
+          },
           "id": {
             "type": "string",
             "format": "uuid"
@@ -39212,7 +39236,13 @@
             ]
           }
         },
-        "additionalProperties": false
+        "additionalProperties": false,
+        "discriminator": {
+          "propertyName": "$type",
+          "mapping": {
+            "MediaReferenceResponseModel": "#/components/schemas/MediaReferenceResponseModel"
+          }
+        }
       },
       "MediaResponseModel": {
         "required": [

src/Umbraco.Cms.Api.Management/ViewModels/TrackedReferences/IReferenceResponseModel.cs

@@ -1,6 +1,8 @@
-namespace Umbraco.Cms.Api.Management.ViewModels.TrackedReferences;
+using Umbraco.Cms.Api.Common.OpenApi;
 
-public interface IReferenceResponseModel
+namespace Umbraco.Cms.Api.Management.ViewModels.TrackedReferences;
+
+public interface IReferenceResponseModel : IOpenApiDiscriminator
 {
     public Guid Id { get; }