JavaScript client: support collectionFormat for parameters

Closes #1953

modules/swagger-codegen/src/main/resources/Javascript/ApiClient.mustache

@@ -31,6 +31,8 @@
     if (param == null) {
       // return empty string for null and undefined
       return '';
+    } else if (param instanceof Date) {
+      return param.toJSON();
     } else {
       return param.toString();
     }
@@ -131,6 +133,31 @@
     return newParams;
   };
 
+  /**
+   * Build parameter value according to the given collection format.
+   * @param {String} collectionFormat one of 'csv', 'ssv', 'tsv', 'pipes' and 'multi'
+   */
+  ApiClient.prototype.buildCollectionParam = function buildCollectionParam(param, collectionFormat) {
+    if (param == null) {
+      return null;
+    }
+    switch (collectionFormat) {
+      case 'csv':
+        return param.map(this.paramToString).join(',');
+      case 'ssv':
+        return param.map(this.paramToString).join(' ');
+      case 'tsv':
+        return param.map(this.paramToString).join('\t');
+      case 'pipes':
+        return param.map(this.paramToString).join('|');
+      case 'multi':
+        // return the array directly as Superagent will handle it as expected
+        return param.map(this.paramToString);
+      default:
+        throw new Error('Unknown collection format: ' + collectionFormat);
+    }
+  };
+
   ApiClient.prototype.deserialize = function deserialize(response, returnType) {
     if (response == null || returnType == null) {
       return null;

modules/swagger-codegen/src/main/resources/Javascript/api.mustache

@@ -42,13 +42,13 @@
         '<baseName>': <paramName><#hasMore>,</hasMore></pathParams>
       };
       var queryParams = {<#queryParams>
-        '<baseName>': <paramName><#hasMore>,</hasMore></queryParams>
+        '<baseName>': <#collectionFormat>this.buildCollectionParam(<paramName>, '<collectionFormat>')</collectionFormat><^collectionFormat><paramName></collectionFormat><#hasMore>,</hasMore></queryParams>
       };
       var headerParams = {<#headerParams>
         '<baseName>': <paramName><#hasMore>,</hasMore></headerParams>
       };
       var formParams = {<#formParams>
-        '<baseName>': <paramName><#hasMore>,</hasMore></formParams>
+        '<baseName>': <#collectionFormat>this.buildCollectionParam(<paramName>, '<collectionFormat>')</collectionFormat><^collectionFormat><paramName></collectionFormat><#hasMore>,</hasMore></formParams>
       };
 
       var contentTypes = [<#consumes>'<mediaType>'<#hasMore>, </hasMore></consumes>];

samples/client/petstore/javascript/src/ApiClient.js

@@ -31,6 +31,8 @@
     if (param == null) {
       // return empty string for null and undefined
       return '';
+    } else if (param instanceof Date) {
+      return param.toJSON();
     } else {
       return param.toString();
     }
@@ -131,6 +133,31 @@
     return newParams;
   };
 
+  /**
+   * Build parameter value according to the given collection format.
+   * @param {String} collectionFormat one of 'csv', 'ssv', 'tsv', 'pipes' and 'multi'
+   */
+  ApiClient.prototype.buildCollectionParam = function buildCollectionParam(param, collectionFormat) {
+    if (param == null) {
+      return null;
+    }
+    switch (collectionFormat) {
+      case 'csv':
+        return param.map(this.paramToString).join(',');
+      case 'ssv':
+        return param.map(this.paramToString).join(' ');
+      case 'tsv':
+        return param.map(this.paramToString).join('\t');
+      case 'pipes':
+        return param.map(this.paramToString).join('|');
+      case 'multi':
+        // return the array directly as Superagent will handle it as expected
+        return param.map(this.paramToString);
+      default:
+        throw new Error('Unknown collection format: ' + collectionFormat);
+    }
+  };
+
   ApiClient.prototype.deserialize = function deserialize(response, returnType) {
     if (response == null || returnType == null) {
       return null;

samples/client/petstore/javascript/src/api/PetApi.js

@@ -100,7 +100,7 @@
       var pathParams = {
       };
       var queryParams = {
-        'status': status
+        'status': this.buildCollectionParam(status, 'multi')
       };
       var headerParams = {
       };
@@ -134,7 +134,7 @@
       var pathParams = {
       };
       var queryParams = {
-        'tags': tags
+        'tags': this.buildCollectionParam(tags, 'multi')
       };
       var headerParams = {
       };

samples/client/petstore/javascript/test/ApiClientTest.js

@@ -36,6 +36,38 @@ describe('ApiClient', function() {
     });
   });
 
+  describe('#buildCollectionParam', function() {
+    var param;
+
+    beforeEach(function() {
+      param = ['aa', 'bb', 123];
+    });
+
+    it('works for csv', function() {
+      expect(apiClient.buildCollectionParam(param, 'csv')).to.be('aa,bb,123');
+    });
+
+    it('works for ssv', function() {
+      expect(apiClient.buildCollectionParam(param, 'ssv')).to.be('aa bb 123');
+    });
+
+    it('works for tsv', function() {
+      expect(apiClient.buildCollectionParam(param, 'tsv')).to.be('aa\tbb\t123');
+    });
+
+    it('works for pipes', function() {
+      expect(apiClient.buildCollectionParam(param, 'pipes')).to.be('aa|bb|123');
+    });
+
+    it('works for multi', function() {
+      expect(apiClient.buildCollectionParam(param, 'multi')).to.eql(['aa', 'bb', '123']);
+    });
+
+    it('fails for invalid collection format', function() {
+      expect(function() { apiClient.buildCollectionParam(param, 'INVALID'); }).to.throwError();
+    });
+  });
+
   describe('#buildUrl', function() {
     it('should work without path parameters in the path', function() {
       expect(apiClient.buildUrl('/abc', {})).to