breeze.js如何对列值求和— sum（UnitsInTotal）

Question

I am using ASP.NET MVC 4 with knockout and Breeze, and trying to sum a column value (sum(UnitsInTotal)) .

I can do it in Knockout foreach, but to avoid it in cshtml (I have my breeze based column filter's which works fine.), I would like to add it on my Breeze based javascript code itself. Any help ...

var serviceAddress = "breeze/Values",
    em = new breeze.EntityManager(serviceAddress),
    getProducts = function () {
        var query = new breeze.EntityQuery("Product");
        var promise = em.executeQuery(query);
        return promise;
    },
    getSumOfUnitsInTotal = function () {
        var query = new breeze,EntityQuery("Product").where...
        var promise=em.executeQuery(query);
        return promise;
}

I am not sure , how to do SUM(UnitsInTotal) which is a column with numeric Data. I would like to know , how to write the Breeze query to get the SUM value. I am new to breeze.

Answer 1

Finally got it.

Here is my BreezeQuery.

 getItemTotal=function() {var queryAggUnitsInTotal= new breeze.EntityQuery("Product").select("UnitPrice");
   return  em.executeQuery(queryAggUnitsInTotal)
   .then(calculateUnitsInTotal ).fail(handleFail);

---

calculateUnitsInTotal = function (data) {var unitsInTotal = 0;

       data.results.forEach(function (result)
       {
           unitsInTotal = unitsInTotal + result.UnitPrice;
       });
    return unitsInTotal; --ko.observable(unitsInTotal);--- Sum of UnitpriceValues

// Total value of my UnitPrice column.-- thru ko.observableArray, append and used in cshtml.I am trying to avoid too many knockout calculation at cshtml.// This approach my cshtml looks better and very clean. --Hope this help some dev's.