Add disciminator to the demo spec

demo/swagger.json

@@ -773,7 +773,11 @@
     "Pet": {
       "type": "object",
       "required": ["name", "photoUrls"],
+      "discriminator": "petType",
       "properties": {
+        "petType": {
+          "type": "string"
+        },
         "id": {
           "type": "integer",
           "format": "int64"
@@ -815,6 +819,56 @@
         "name": "Pet"
       }
     },
+    "Cat": {
+      "description": "A representation of a cat",
+      "allOf": [
+        {
+          "$ref": "#/definitions/Pet"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "huntingSkill": {
+              "type": "string",
+              "description": "The measured skill for hunting",
+              "default": "lazy",
+              "enum": [
+                "clueless",
+                "lazy",
+                "adventurous",
+                "aggressive"
+              ]
+            }
+          },
+          "required": [
+            "huntingSkill"
+          ]
+        }
+      ]
+    },
+    "Dog": {
+      "description": "A representation of a dog",
+      "allOf": [
+        {
+          "$ref": "#/definitions/Pet"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "packSize": {
+              "type": "integer",
+              "format": "int32",
+              "description": "the size of the pack the dog is from",
+              "default": 0,
+              "minimum": 0
+            }
+          },
+          "required": [
+            "packSize"
+          ]
+        }
+      ]
+    },
     "ApiResponse": {
       "type": "object",
       "properties": {