Not getting value of default selected checkbox - angularjs

Question

I am trying to get the of checkbox selected and store its result in an array . when the checkboxes are selected by default its not getting its value but after toggling if if a particular checkbox is selected its
working correctly.Please tell me what i am doing wrong and thanks in advance.
here my html code:
<div ng-repeat="album in albums" ng-disabled="checked">
<input type="checkbox" ng-model="album.selected" value={{album.value}} ng-checked = "true"/> {{album.name}}
</div>
<button ng-click = "setAlbums()" type = "submit" class = "col-sm-3 btn btn-primary" style = "margin-left:3%;"> Save </button>
here my js code:
$scope.albums = [{
value: 3,
name: 'a'
},
{
value: 4,
name: 'b'
},
{
value: 5,
name: 'c'
},
{
value: 6,
name: 'd'
},
{
value: 7,
name: 'd'
},
{
value: 8,
name: 'e'
},
{
value: 9,
name: 'f'
}];
$scope.setAlbums = function () {
$scope.albumNameArray = [];
angular.forEach($scope.albums, function(album){
if (album.selected) $scope.albumNameArray.push(album.value);
});
console.log("$scope.albumNameArray",$scope.albumNameArray)
}

Answer 1

Initially while ng-repeat is rendering the array it will look for the album.selected value in the array itself, so if its not able to find it, it will be virtually checked due to your ng-checked = true attribute but it will not be set in the ng-model, so
try it like this, use a another property called ng-init = "album.selected = true" in,
<input type="checkbox" ng-model="album.selected" value="{{album.value}}" ng-checked="true" ng-init="album.selected = true"/>
then try with the save button click.
PLUNKER WITH YOUR CODE