ionic framework - AngularJS - Update a variable of a factory from a controller -

i developping web app ionic 1 , angularjs 1.

in factory (userfact) :

.factory('userfact', function() { var user = []; return {     'setuser': function(user) {         this.user = user;         console.log('(2) user set: ' + this.user);         console.log('(3) user id now: ' + this.user.uid);     },     'updatesport': function(sportid, registered) {         console.log('update sport: ' + sportid + ' --> ' + registered);         console.log('(4) user uid: ' + this.user.uid);         var ref = firebase.database().ref('users/' + this.user.uid + '/sports/');          // sync down server         var list = [];         ref.on('value', function(snap) { list = snap.val(); });          if(registered) {             list.splice(0, 0, {id: sportid});         } else {          }          ref.set(list);     } }; }) 

in controller :

function ($scope, $stateparams, $state, databasefact, userfact) {  // variables $scope.sports = []; $scope.sports = databasefact.getsports();  // functions $scope.updatesport = userfact.updatesport;  // execution firebase.auth().onauthstatechanged(function(user) {     if (user) {         userfact.setuser(user);         console.log('(1) ctrl user uid: ' + user.uid);     } });  } 

according console: logs (1), (2) , (3) display userid form db (4) undefined...

any idea?

thanks

update:

manuel, sorry, think had missed point of question. correct, using factory/service, correct way store state of application. above, not see reason code not work. user must getting re-assigned elsewhere seeing undefined in (4), if not seeing same in (3). simplicity sake, removed references firebase , created working demo: https://plnkr.co/edit/van7ysche8ggrqmzgfsa?p=preview

while demo may not solve problem, hope illustrates factory variable (user) persisted in memory , usable across multiple factory method calls.

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original answer (missed point) below:

update state change handler save user on controller scope:

firebase.auth().onauthstatechanged(function(user) {     if (user) {         $scope.user = user;         userfact.setuser(user);         console.log('(1) ctrl user uid: ' + user.uid);     } }); 

then, in template, invoke updatesport method, using user scope variable:

updatesport(user, true); 

or

updatesport(user, false);