Is orderByChild(x).equalTo(y).limitToFirst(n) running server-side ?

[olivier...@innovorder.fr]

Hi Firebase Support,

Is orderByChild(x).equalTo(y).limitToFirst(n)  running on the firebase server-side ?

Let's say I have two Node.js processes listening to a Firebase node "tasks". On each node, I do :

1. Process1: tasks.orderByChild('_state').equalTo("state_1").limitToFirst(1)
2. Process2: tasks.orderByChild('_state').equalTo("state_2").limitToFirst(1)

The "tasks "firebase node is going to receive many child nodes with different "_state" values. I'd like to know if each Node.js process will receive all events or just the one with the corresponding "_state" value as defined by the orderByChild().equalTo() ? (server-side VS client-side)

Thank you very much in advance,

Kind regards, 

[Jacob Wenger]

Hey Olivier,

Firebase can actually do both. By default, the Firebase clients can perform ad-hoc queries on the client-side. This is to ease development and to make sure things work out-of-the-box. However, we strongly suggest that you index your data using .indexOn rules to get server-side filtering. This will be critical as your app goes to production and starts to grow. See Index Your Data for the full details, including some examples.

Cheers,

Jacob

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