Breeze doesn't expand more than one navigation property path?

问题

if I run the following query using the NorthindModel, NorthwindDataContext from the breeze samples only the first navigation property is expaned. All other returning null:

    var query = EntityQuery.from("OrderDetails")
        .where("OrderID", "==", 11069)
        .expand("Order.Customer", "Order.Employee");
    manager.executeQuery(query).then(querySucceeded).fail(queryFailed);

    function querySucceeded(data){
         var customer = data.results[0].Order().Customer();
         var employee = data.results[0].Order().Employee(); // returns null!!!!!
    }

If I change the order in the expand paramerter list than customer is set to null:

    var query = EntityQuery.from("OrderDetails")
        .where("OrderID", "==", 11069)
        .expand("Order.Employee", "Order.Customer");
    manager.executeQuery(query).then(querySucceeded).fail(queryFailed);

    function querySucceeded(data){
         var customer = data.results[0].Order().Customer(); // returns null!!!!!
         var employee = data.results[0].Order().Employee();         }

What's the problem here?

回答1:

The 'expand' method takes a single argument that is either an array or a comma delimited string. You gave it two arguments. So try the following instead.

var query = EntityQuery.from("OrderDetails") .where("OrderID", "==", 11069) .expand(["Order.Customer", "Order.Employee"]);

Note the [].

来源：https://stackoverflow.com/questions/14235727/breeze-doesnt-expand-more-than-one-navigation-property-path