Firebase.push failed: first argument contains an invalid key ($key)

[renansuzin]

Version info

Angular: 2.2.1

Firebase: 3.6.5

AngularFire: 2.0.0

Other (e.g. Ionic/Cordova, Node, browser, operating system):

Ionic Framework: 2.0.0-rc.5
Ionic Native: 2.2.11
Ionic App Scripts: 1.0.0
Angular Core: 2.2.1
Angular Compiler CLI: 2.2.1
Node: 6.9.3
OS Platform: Windows 10
Navigator Platform: Win32
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Debug output

Runtime Error
Error in ./FormTurmaPage class FormTurmaPage - caused by: Firebase.push failed: first argument contains an invalid key ($key) in property 'escola1.turmas.alunos:.0'. Keys must be non-empty strings and can't contain ".", "#", "$", "/", "[", or "]"

** Screenshots **

I'm trying to push a array(alunosTurma[]) of objects(aluno) to a new Firebase item(turma). In my code a get all the alunos and store in a firebaseobservablelist, in the alunosTurma list i store some aluno's objects and when a try to push the alunos list from a new Turma object on firebase i get the error.

[byrondover]

@renansuzin This should be addressed by #787.

See #197 for a workaround, and #302 for more context / details. As a side note, nesting a list of alunos within turmas may be a bit of an anti-pattern, and you might want to consider instead using separate calls to retrieve alunos, as necessary.

https://firebase.google.com/docs/database/web/structure-data#avoid_nesting_data

[renansuzin]

@byrondover

Thanks for response, in this case a need to list all of alunos to user select and save some in the turma, i dont are saving all the alunos in the turma only the selected by user, im using the alunosTurma list to store the selected alunos and when i try to push the alunosTurma to turma i get the error.

The data scructure is like this:

alunos = all the alunos for the user select
alunosTurma = alunos list to store the selected alunos by user
turma = a turma object, it need to have a list of alunos

[byrondover]

Fair enough.

You may want to consider implementing a lookup collection in Firebase for students belonging to classrooms (e.g. turmaAlunos), but it depends on your use case and query patterns. @davideast has a great video about this on YouTube: https://youtu.be/ran_Ylug7AE.

Feel free to ping me on Gitter if you'd like to discuss further!

https://gitter.im/angular/angularfire2

[renansuzin]

Thanks for your help @byrondover, i'm going to watch the video and follow the @davideast instructions to structure the data of my app, i already joined in the gitter group, thanks for invite.