fix: x-extendedDiscriminator not working

closes #217

lib/utils/spec-manager.ts

@@ -9,6 +9,7 @@ import { MdRenderer } from './md-renderer';
 
 import { SwaggerOperation, SwaggerParameter } from './swagger-typings';
 import { snapshot } from './helpers';
+import { WarningsService } from '../services/warnings.service';
 
 function getDiscriminator(obj) {
   return obj.discriminator || obj['x-extendedDiscriminator'];
@@ -204,12 +205,23 @@ export class SpecManager {
 
       if (idx < 0) continue;
 
-      let derivedName = defName;
+      let derivedName;
       if (extendedDiscriminatorProp) {
-        let prop = def.properties && def.properties[extendedDiscriminatorProp];
-        if (prop && prop.enum && prop.enum.length === 1) {
-          derivedName = prop.enum[0];
+        let subDefs = def.allOf || [];
+        for (let def of subDefs) {
+          let prop = def.properties && def.properties[extendedDiscriminatorProp];
+          if (prop && prop.enum && prop.enum.length === 1) {
+            derivedName = prop.enum[0];
+            break;
+          }
         }
+        if (!derivedName) {
+          WarningsService.warn(`Incorrect usage of x-extendedDiscriminator at ${defPointer}: `
+            + `can't find corresponding enum with single value in definition "${defName}"`);
+          continue;
+        }
+      } else {
+        derivedName = defName;
       }
 
       res.push({name: derivedName, $ref: `#/definitions/${defName}`});

manual-types/index.d.ts

@@ -13,6 +13,11 @@ declare module "*.css" {
   export default content;
 }
 
+declare module "*.json" {
+  const content: string;
+  export default content;
+}
+
 declare var LIB_VERSION: any;
 declare var IS_PRODUCTION: any;
 declare var AOT: any;

tests/unit/SpecManager.spec.ts

@@ -1,6 +1,8 @@
 'use strict';
 
 import { SpecManager } from '../../lib/utils/spec-manager';
+import * as xExtendedDefs from './x-extended-defs.json';
+
 describe('Utils', () => {
   describe('Schema manager', () => {
     let specMgr: SpecManager;
@@ -175,6 +177,23 @@ describe('Utils', () => {
         deriveDefs.should.be.instanceof(Array);
         deriveDefs.should.be.empty();
       });
+
+      it('should correctly work with x-extendedDiscriminator', () => {
+        specMgr._schema = {
+          definitions: xExtendedDefs
+        };
+
+        let deriveDefs = specMgr.findDerivedDefinitions('#/definitions/Payment');
+        deriveDefs.should.be.instanceof(Array);
+        deriveDefs.should.be.deepEqual([
+          {
+            name: 'cash',
+            $ref: '#/definitions/CashPayment'
+          }, {
+            name: 'paypal',
+            $ref: '#/definitions/PayPalPayment'
+        }])
+      });
     });
   });
 });

tests/unit/x-extended-defs.json

@@ -0,0 +1,57 @@
+{
+  "Payment": {
+    "x-extendedDiscriminator": "type",
+    "type": "object",
+    "required": [
+      "type"
+    ],
+    "properties": {
+      "type": {
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      }
+    }
+  },
+  "CashPayment": {
+    "allOf": [
+      {
+        "$ref": "#/definitions/Payment"
+      },
+      {
+        "properties": {
+          "type": {
+            "type": "string",
+            "enum": [
+              "cash"
+            ]
+          },
+          "currency": {
+            "type": "string"
+          }
+        }
+      }
+    ]
+  },
+  "PayPalPayment": {
+    "allOf": [
+      {
+        "$ref": "#/definitions/Payment"
+      },
+      {
+        "properties": {
+          "type": {
+            "type": "string",
+            "enum": [
+              "paypal"
+            ]
+          },
+          "userEmail": {
+            "type": "string"
+          }
+        }
+      }
+    ]
+  }
+}