How to use the can-connect/helpers/.forEach.call function in can-connect

combineDataPromise.then(function(combinedData){
						// farm out requests
						forEach.call(combinedData, function(combined){

							base.getListData(combined.set).then(function(data){

								if(combined.pendingRequests.length === 1) {
									combined.pendingRequests[0].deferred.resolve(data);
								} else {
									forEach.call(combined.pendingRequests, function(pending){
										pending.deferred.resolve( {data: self.getSubset(pending.set, combined.set, getItems(data) )} );
									});
								}

							});
						});
					});

base.getListData(combined.set).then(function(data){

								if(combined.pendingRequests.length === 1) {
									combined.pendingRequests[0].deferred.resolve(data);
								} else {
									forEach.call(combined.pendingRequests, function(pending){
										pending.deferred.resolve( {data: self.getSubset(pending.set, combined.set, getItems(data) )} );
									});
								}

							});
						});