getting sum of grouped data angularjs - angular-filter

Question

i am using angular-filter to group data. while i was able to group data and get data length(orderfood), i am not able to get sum of the qty in my grouped data. my plunk demo

the result i got

Isnain Meals - 2

Chicken Burger - 2

the result i need

Isnain Meals - 4 //sum of qty of Isnain Meals from JSON data (1+3)

Chicken Burger - 9 //sum of qty of Chicken Burger from JSON data (3+6)

JSON Data

$scope.orders = [{
  "_id": "56b0c315e179bb0e00a44dbf",
  "orderfood": [{
    "_id": "569d865bff1fe20e00f8ba97",
    "qty": "1",
    "confirm": true,
    "price": 154,
    "name": "Isnain Meals"
  }, {
    "_id": "569d865bff1fe20e00f8ba98",
    "qty": "3",
    "confirm": true,
    "price": 154,
    "name": "Isnain Meals"
  }],
  "content": "9176649143",
  "created": "2016-02-02T14:54:13.926Z"
}, {
  "_id": "56b06ed25b53250e00ccbd73",
  "orderfood": [{
    "_id": "569d84f04834c10e003dff36",
    "qty": "6",
    "confirm": true,
    "price": 125,
    "name": "Chicken Burger"
  }],
  "content": "6886058585",
  "created": "2016-02-02T08:54:42.986Z"
}, {
  "_id": "56b06ed25b53250e00ccbd74",
  "orderfood": [{
    "_id": "569d84f04834c10e003dff37",
    "qty": "3",
    "confirm": true,
    "price": 125,
    "name": "Chicken Burger"
  }],
  "content": "6886058585",
  "created": "2016-02-02T08:54:42.986Z"
}];

Controller Code

$scope.getOrderFoods = function() {
var orderfood = [];

angular.forEach($scope.orders, function(order) {
  angular.forEach(order.orderfood, function(orderfoo) {
    if (orderfood.indexOf(orderfoo) == -1) {
      orderfood.push(orderfoo);
    }
  })
});
return orderfood;
}

HTML

<div ng-repeat="(key,data) in getOrderFoods() | groupBy:'name'">
  <p>{{key}} - {{data.length}}</p>
<!-- instead of the data.length, i need the sum of qty   -->
</div>

my plunk demo

Answer 1

You can use javascript Array.reduce method to generate the sum of quantity. here is the Plunk

<div ng-repeat="(key,data) in getOrderFoods() | groupBy:'name'">
      <p>{{key}} - {{reduce(data)}}</p>
</div>


$scope.reduce= function(data){
   return data.reduce(function(previousValue,currentValue, currentIndex, array){
     return previousValue + parseInt(currentValue.qty);
  }, 0);
}