localForage, separe by filtering an input array and store in localforage

angular_snippest.js

/*
Split an array in several sub-array by id.

*/
var separeArrayById = function (data) {
  var valueById = {};
  for (var i = 0; i < data.length; i++) {
    if (!valueById.hasOwnProperty(data[i].id)) {
      valueById[data[i].id] = data.filter(function (el) {
                                    return el.id === data[i].id;
                                     });
      }
   }
  return valueById;
}


/*
Save the value.

*/

var copyDataInTheDB = function (data) {
  localforage.getItem(RILIEVO_KEY + data[0].id).then(function (value) {
    if (!value) {
      value = [];
    }
   for (var i = 0; i < data.length; i++) {
      value.push(data[i]);
   }
    localforage.setItem(RILIEVO_KEY + data[0].id, value).then(function () {
    
    }).catch(function (err) {
      console.log("errore nel memorizzare " + data[0].id);
    });

  }).catch(function (err) {
            console.log(err);
 });
}


$http.get(path,
  {
    headers: {'Content-Type': 'application/json',
    'Authorization': " Basic " + $base64.encode(user.username + ":" + user.pwd)
    }
  }).success(function (data) {
    var valueById = separeArrayById(data);
    for (var k in valueById) {
      if (valueById.hasOwnProperty(k)) {
        copyDataInTheDB(valueById[k]);
        }
    }
      localStorage[LAST_UPDATE_DATA] = new Date();
      deferred.resolve(true);
    }).error(function (reason) {
          deferred.reject(reason);
    });