test: add polymorphism test for #511

src/middlewares/parsers/schema.preprocessor.ts

@@ -259,7 +259,7 @@ export class SchemaPreprocessor {
       const options = opts[kind];
       options.path = node.path;
 
-      if (nschema) {
+      if (nschema) { // This null check should no longer be necessary
         this.handleSerDes(pschema, nschema, options);
         this.handleReadonly(pschema, nschema, options);
         this.processDiscriminator(pschema, nschema, options);

test/511.spec.ts

@@ -0,0 +1,155 @@
+import * as request from 'supertest';
+import { createApp } from './common/app';
+
+describe('511 schema.preprocessor inheritance', () => {
+  let app = null;
+
+  before(async () => {
+    // set up express app
+    app = await createApp(
+      {
+        apiSpec: apiSpec(),
+        validateResponses: true,
+      },
+      3001,
+      (app) => {
+        app.post('/example', (req, res) => {
+          res.status(201).json({
+            object_type: 'PolyObject1',
+            shared_prop1: 'sp1',
+            shared_prop2: 'sp2',
+            polyObject1SpecificProp1: 'poly1',
+          });
+        });
+      },
+      false,
+    );
+    return app;
+  });
+
+  after(() => {
+    app.server.close();
+  });
+
+  it('should return 201', async () =>
+    request(app)
+      .post(`/example`)
+      .send({
+        object_type: 'PolyObject1',
+        shared_prop1: 'sp1',
+        shared_prop2: 'sp2',
+        polyObject1SpecificProp1: 'poly1',
+      })
+      .expect(201));
+});
+
+function apiSpec(): any {
+  return {
+    openapi: '3.0.0',
+    info: {
+      title: 'Example API',
+      version: '0.1.0',
+    },
+    servers: [
+      {
+        url: 'https://localhost/',
+      },
+    ],
+    paths: {
+      '/example': {
+        post: {
+          description: 'Request',
+          requestBody: {
+            content: {
+              'application/json': {
+                schema: {
+                  $ref: '#/components/schemas/PolyObject',
+                },
+              },
+            },
+          },
+          responses: {
+            '201': {
+              description: 'Response',
+              content: {
+                'application/json': {
+                  schema: {
+                    type: 'object',
+                  },
+                },
+              },
+            },
+          },
+        },
+      },
+    },
+    components: {
+      schemas: {
+        PolyObject: {
+          type: 'object',
+          discriminator: {
+            propertyName: 'object_type',
+            mapping: {
+              PolyObject1: '#/components/schemas/PolyObject1',
+              PolyObject2: '#/components/schemas/PolyObject2',
+            },
+          },
+          oneOf: [
+            {
+              $ref: '#/components/schemas/PolyObject1',
+            },
+            {
+              $ref: '#/components/schemas/PolyObject2',
+            },
+          ],
+        },
+        PolyObjectBase: {
+          type: 'object',
+          required: ['object_type'],
+          properties: {
+            object_type: {
+              type: 'string',
+              enum: ['PolyObject1', 'PolyObject2'],
+            },
+            shared_prop1: {
+              type: 'string',
+            },
+            shared_prop2: {
+              type: 'string',
+            },
+          },
+        },
+        PolyObject1: {
+          allOf: [
+            {
+              $ref: '#/components/schemas/PolyObjectBase',
+            },
+            {
+              type: 'object',
+              properties: {
+                polyObject1SpecificProp1: {
+                  type: 'string',
+                },
+              },
+            },
+          ],
+        },
+        PolyObject2: {
+          allOf: [
+            {
+              $ref: '#/components/schemas/PolyObjectBase',
+            },
+            {
+              type: 'object',
+              properties: {
+                polyObject2SpecificProp1: {
+                  type: 'string',
+                },
+              },
+            },
+          ],
+        },
+      },
+    },
+  };
+}