What is the best way to organize an AngularFire collection?

Question

What is the best way to organize an AngularFire collection?

  $items = [];
  var reference = new Firebase("https://****.firebaseio.com/");
  var queryRef = reference.limit(5);

  angularFire(queryRef, $items, "items");

<div ng-repeat="item in items" >
<span>{{item.title}}</span>
</div>

Is there a way to sort these items by their "title" attribute? I've come across some similar questions but the proposed solutions don't seem to be applicable to this particular scenario.

javascript angularjs firebase angularfire

Answer 1

Answer №1

When dealing with $scope.items as an array of objects (as indicated by $scope.items = []), you have the option to utilize the angular orderBy filter:

<!-- This example will NOT work with Firebase -->
<div ng-repeat="item in items | orderBy:'title'">
  <span>{{item.title}}</span>
</div>

However, it's worth mentioning that setting items as an array can be misleading, since you are actually storing and accessing your "items" as a list of key-value pairs, not an array. Sorting objects in javascript is generally more complex, but one approach to achieve this is by using a custom filter:

app.filter('orderObjectBy', function(){
  return function(input, attribute) {
    if (!angular.isObject(input)) return input;

    var array = [];
    for(var objectKey in input) {
      array.push(input[objectKey]);
    }

    function compare(a,b) {
      if (a[attribute] < b[attribute])
        return -1;
      if (a[attribute] > b[attribute])
        return 1;
      return 0;
    }

    array.sort(compare);
    return array;
  }
});

With this custom filter, you can now order by any property of your item:

<div ng-repeat="item in items | orderObjectBy:'title'">
  <span>{{item.title}}</span>
</div>

Here's a fiddle for demonstration purposes. Additionally, your custom filter could potentially simplify by stopping at the array conversion, allowing you to use the standard orderBy filter as suggested here.

Lastly, it's important to note that you also have the option to sort "server-side" with Firebase priorities.

Answer 2

When dealing with $scope.items as an array of objects (as indicated by $scope.items = []), you have the option to utilize the angular orderBy filter:

<!-- This example will NOT work with Firebase -->
<div ng-repeat="item in items | orderBy:'title'">
  <span>{{item.title}}</span>
</div>

However, it's worth mentioning that setting items as an array can be misleading, since you are actually storing and accessing your "items" as a list of key-value pairs, not an array. Sorting objects in javascript is generally more complex, but one approach to achieve this is by using a custom filter:

app.filter('orderObjectBy', function(){
  return function(input, attribute) {
    if (!angular.isObject(input)) return input;

    var array = [];
    for(var objectKey in input) {
      array.push(input[objectKey]);
    }

    function compare(a,b) {
      if (a[attribute] < b[attribute])
        return -1;
      if (a[attribute] > b[attribute])
        return 1;
      return 0;
    }

    array.sort(compare);
    return array;
  }
});

With this custom filter, you can now order by any property of your item:

<div ng-repeat="item in items | orderObjectBy:'title'">
  <span>{{item.title}}</span>
</div>

Here's a fiddle for demonstration purposes. Additionally, your custom filter could potentially simplify by stopping at the array conversion, allowing you to use the standard orderBy filter as suggested here.

Lastly, it's important to note that you also have the option to sort "server-side" with Firebase priorities.

What is the best way to organize an AngularFire collection?

Answer №1

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