feat(example): set discriminated properties to mapped value (#8213)

src/core/plugins/samples/fn.js

@@ -346,7 +346,20 @@ export const sampleFromSchemaGeneric = (schema, config={}, exampleOverride = und
       if(!canAddProperty(propName)) {
         return
       }
+      if(Object.prototype.hasOwnProperty.call(schema, "discriminator") &&
+        schema.discriminator &&
+        Object.prototype.hasOwnProperty.call(schema.discriminator, "mapping") &&
+        schema.discriminator.mapping &&
+        schema.discriminator.propertyName === propName) {
+        for (let pair in schema.discriminator.mapping){
+          if (schema.$$ref.search(schema.discriminator.mapping[pair]) !== -1) {
+            res[propName] = pair
+            break
+          }
+        }
+      } else {
         res[propName] = sampleFromSchemaGeneric(props[propName], config, overrideE, respectXML)
+      }
       propertyAddedCounter++
     }
   }

test/unit/core/plugins/samples/fn.js

@@ -605,6 +605,74 @@ describe("sampleFromSchema", () => {
     })
   })
 
+  describe("discriminator mapping example", () => {
+    it("returns an example where discriminated field is equal to mapping value", () => {
+      let definition = {
+        "type": "array",
+        "items": {
+          "oneOf": [
+            {
+              "required": [
+                "type"
+              ],
+              "type": "object",
+              "properties": {
+                "type": {
+                  "type": "string",
+                  "enum": [
+                    "TYPE1",
+                    "TYPE2"
+                  ]
+                }
+              },
+              "discriminator": {
+                "propertyName": "type",
+                "mapping": {
+                  "TYPE1": "#/components/schemas/FirstDto",
+                  "TYPE2": "#/components/schemas/SecondDto"
+                }
+              },
+              "$$ref": "examples/swagger-config.yaml#/components/schemas/FirstDto"
+            },
+            {
+              "required": [
+                "type"
+              ],
+              "type": "object",
+              "properties": {
+                "type": {
+                  "type": "string",
+                  "enum": [
+                    "TYPE1",
+                    "TYPE2"
+                  ]
+                }
+              },
+              "discriminator": {
+                "propertyName": "type",
+                "mapping": {
+                  "TYPE1": "#/components/schemas/FirstDto",
+                  "TYPE2": "#/components/schemas/SecondDto"
+                }
+              },
+              "$$ref": "examples/swagger-config.yaml#/components/schemas/SecondDto"
+            }
+          ]
+        }
+      }
+
+      let expected = [
+        {
+          "type": "TYPE1"
+        }, {
+          "type": "TYPE2"
+        }
+      ]
+
+      expect(sampleFromSchema(definition)).toEqual(expected)
+    })
+  })
+
   it("should use overrideExample when defined", () => {
     const definition = {
       type: "object",