Firebase search by child value

Question

I have the following structure on my Firebase database:

I would like to search for an user by name, last name or email but as I don\'t have the user key in the leve

Answer 1

A warning to avoid unpleasant surprises: when you use orderByChild and equalTo do not forget to add an index on your data (here's the doc)

If you don't all the nods will be downloaded and filtered client side which can become very expensive if your database grows.