firebase get url by nested child id for tree like

Question

I have following structure in firebase:

 data/users/<id_user>/lists/<id_list>/children/<child1_id>/children/<child2_id>

how to get this full URL, knowing the only child2_id?

(preferably typescript, angularfire 2)

Answer 1

Firebase Realtime Database queries can search the child nodes of a location. But the value you search for must be at a fixed path under each child.

So if you know data/users/<id_user>/lists/<id_list>/children/<child1_id>, you can query to find the child under that with child2_id. But you can't search for child2_id across multiple nested unknown paths.

For more on this, see Firebase Query Double Nested, and possibly (depending on your use-case) Firebase query if child of child contains a value.