Add an item to a firebase collection - angularjs

Question

I need to append an item in one or more collections in Firebase Database using angularfire (AngularJS)
For example, if I have:
users {
Marcelo: {
userid: 1
},
Javier: {
userid: 2
}
}
How can I append a new item in each collection, getting something like this?
users {
Marcelo: {
userid: 1
state: "enabled"
},
Javier: {
userid: 2
state: "enabled"
}
}

Answer 1

There is no specific AngularFire operation for this. But since AngularFire is just built on top of the Firebase JavaScript SDK, you use that to read the data and loop over it and then update each item.
A short snippet to get you started:
var ref = firebase.database().ref("users");
users.once("value", function(snapshot) {
snapshot.forEach(function(userSnapshot) {
userSnapshot.ref.update({ state: "enabled" });
});
});

Answer 2

In this sample we create a function to insert param in our object
//object = users object
//key = state or something else
//value = true or something else
var insertParam = function(object, key, value) {
for (var _key in object) {
object[_key][key] = value;
}
}
var app = angular.module("app", []);
app.controller("ctrl", [
"$scope",
function($scope) {
$scope.users = {
Marcelo: {
userid: 1
},
Javier: {
userid: 2
}
}
var insertParam = function(object, key, value) {
for (var _key in object) {
object[_key][key] = value;
}
}
insertParam($scope.users, "state", true);
}
]);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app" ng-controller="ctrl">
<ul>
<li ng-repeat="(key, option) in users">
{{key}}
<ul>
<li><b>userId:</b> {{option.userid}}</li>
<li><b>state:</b> {{option.state}}</li>
</ul>
</li>
</ul>
</div>