Best way of getting the key after $add
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21-12-2019 - |
Pregunta
I am using angularFire v 0.5.0
On my returned object I do a $add.
What would be the best way to get the generated key?
It must be something in the succes callback of the $add, because the key will come back asynchrounlusly?
scope.settings = $firebase(ref);
scope.settings.value = {
vat: {
inclusive: true
}
}
}
scope.settings.$add (scope.settings.value).then( function ( {
scope.settings.key = ???
});
note: this is not the actual code, this is just to clarify the problem.
The actiual code is inside a factory in the loaded event, and there is a check if there is already a settings object inside the database.
This somewhat strange construct is to make it easyer for consumers of the factory to change the settings. The settings is a singleton. AngularFire does not return a array of objects, but every item is a object in the settings, with its own key.
Solución
$add
returns a Firebase ref. Call name()
on that ref.
scope.settings.$add(…).name();
See https://github.com/firebase/angularFire/blob/master/angularfire.js#L127.
Otros consejos
from the angularfire docs:
The $add method takes a single argument of any type. It will append this value as a member of a list (ordered in chronological order). This is the equivalent of calling push(value) on a Firebase reference.
from the firebase docs (about push()):
Returns A Firebase reference for the generated location.
so, i think the "key" that you want is the return value of the $add.
Maybe they've changed it in newer versions, now it works like this:
$add() will return a promise. You have to use the callback which runs on success. For example:
var something = $scope.somethings.$add({name: "foo"});
something.then(function(e) {
console.log(e.name())
});
This allows you to perform different actions based on the outcome of the save/write attempt to Firebase.