fix: path parameters are not correctly override, fixes #481

src/services/OpenAPIParser.ts

@@ -46,8 +46,8 @@ export class OpenAPIParser {
 
   constructor(
     spec: OpenAPISpec,
-    specUrl: string | undefined,
-    private options: RedocNormalizedOptions,
+    specUrl?: string,
+    private options: RedocNormalizedOptions = new RedocNormalizedOptions({}),
   ) {
     this.validate(spec);
     this.preprocess(spec);
@@ -166,6 +166,13 @@ export class OpenAPIParser {
     return obj;
   }
 
+  shalowDeref<T extends object>(obj: OpenAPIRef | T): T {
+    if (this.isRef(obj)) {
+      return this.byRef<T>(obj.$ref)!;
+    }
+    return obj;
+  }
+
   /**
    * Merge allOf contsraints.
    * @param schema schema with allOF

src/services/models/Operation.ts

@@ -12,6 +12,7 @@ import {
   getOperationSummary,
   isAbsolutePath,
   JsonPointer,
+  mergeParams,
   sortByRequired,
   stripTrailingSlash,
 } from '../../utils';
@@ -65,7 +66,9 @@ export class OperationModel implements IMenuItem {
     this.id =
       operationSpec.operationId !== undefined
         ? 'operation/' + operationSpec.operationId
-        : this.parent !== undefined ? this.parent.id + operationSpec._$ref : operationSpec._$ref;
+        : this.parent !== undefined
+          ? this.parent.id + operationSpec._$ref
+          : operationSpec._$ref;
 
     this.name = getOperationSummary(operationSpec);
     this.description = operationSpec.description;
@@ -83,9 +86,11 @@ export class OperationModel implements IMenuItem {
     this.codeSamples = operationSpec['x-code-samples'] || [];
     this.path = JsonPointer.baseName(this._$ref, 2);
 
-    this.parameters = operationSpec.pathParameters
-      .concat(operationSpec.parameters || [])
-      .map(paramOrRef => new FieldModel(parser, paramOrRef, this._$ref, options));
+    this.parameters = mergeParams(
+      parser,
+      operationSpec.pathParameters,
+      operationSpec.parameters,
+    ).map(paramOrRef => new FieldModel(parser, paramOrRef, this._$ref, options));
 
     if (options.requiredPropsFirst) {
       sortByRequired(this.parameters);

src/utils/__tests__/openapi.test.ts

@@ -4,8 +4,12 @@ import {
   getStatusCodeType,
   isOperationName,
   isPrimitiveType,
+  mergeParams,
 } from '../';
 
+import { OpenAPIParser } from '../../services';
+import { OpenAPIParameter } from '../../types';
+
 describe('Utils', () => {
   describe('openapi getStatusCode', () => {
     it('Should return info for status codes within 100 and 200', () => {
@@ -183,4 +187,39 @@ describe('Utils', () => {
       expect(isPrimitiveType(schema)).toEqual(false);
     });
   });
+
+  describe('openapi mergeParams', () => {
+    it('Should deduplicate params with same "name" and "in"', () => {
+      const pathParams: OpenAPIParameter[] = [
+        {
+          name: 'param1',
+          in: 'path',
+          description: 'path',
+        },
+        {
+          name: 'param2',
+          in: 'path',
+        },
+      ];
+      const operationParams: OpenAPIParameter[] = [
+        {
+          name: 'param1',
+          in: 'path',
+          description: 'oper',
+        },
+        {
+          name: 'param2',
+          in: 'query',
+        },
+      ];
+
+      const parser = new OpenAPIParser({ openapi: '3.0' } as any);
+
+      const res = mergeParams(parser, pathParams, operationParams) as OpenAPIParameter[];
+      expect(res).toHaveLength(3);
+      expect(res[0]).toEqual(pathParams[1]);
+      expect(res[1]).toEqual(operationParams[0]);
+      expect(res[2]).toEqual(operationParams[1]);
+    });
+  });
 });

src/utils/openapi.ts

@@ -1,4 +1,5 @@
-import { OpenAPIOperation, OpenAPISchema } from '../types';
+import { OpenAPIParser } from '../services/OpenAPIParser';
+import { OpenAPIOperation, OpenAPIParameter, OpenAPISchema, Referenced } from '../types';
 
 export function getStatusCodeType(statusCode: string | number, defaultAsError = false): string {
   if (statusCode === 'default') {
@@ -178,4 +179,24 @@ export function sortByRequired(
   });
 }
 
+export function mergeParams(
+  parser: OpenAPIParser,
+  pathParams: Array<Referenced<OpenAPIParameter>> = [],
+  operationParams: Array<Referenced<OpenAPIParameter>> = [],
+): Array<Referenced<OpenAPIParameter>> {
+  const operationParamNames = {};
+  operationParams.forEach(param => {
+    param = parser.shalowDeref(param);
+    operationParamNames[param.name + '_' + param.in] = true;
+  });
+
+  // filter out path params overriden by operation ones with the same name
+  pathParams = pathParams.filter(param => {
+    param = parser.shalowDeref(param);
+    return !operationParamNames[param.name + '_' + param.in];
+  });
+
+  return pathParams.concat(operationParams);
+}
+
 export const SECURITY_SCHEMES_SECTION = 'section/Authentication/';