How to Bind OData $count from expanded collection in an XML view

Question

May be this is a basic question, but I have trouble binding the OData count in XML view.

In the following example, I want to bind the count of products from the ODat

Answer 1

I dont think its currently possible - $count is an OData query option, the equivalent in ODataListBinding is length, eg Products.length I cant think of a way to bind to it

you can achieve the count in a couple of ways using a formatter

option 1 - the simplest, create a list binding which reads the total number of products, it does a synchronous call and returns only the $count

function productCount(oValue) {
    //return the number of products linked to Category // sync call only to get $count
    if (oValue) {
        var sPath = this.getBindingContext().getPath() + '/Products';
        var oBindings = this.getModel().bindList(sPath);
        return oBindings.getLength();
    }
};

  
 

option 2 - use an expand and return a very small set of data, in this case only CategoryName and ProductID, the caveat here is whether you have to by pass table paging to get full list

function productCount(oValue) {
    //read the number of products returned
    if (oValue) {
        return oValue.length;
    }
};