Ndtyjky

How can i get All chats where Users contains a specific Uid

 Query sItemQuery = mDatabase.getReference().child("chats").limitToLast(200);



        FirebaseRecyclerOptions<ChatMetaData> options =

                new FirebaseRecyclerOptions.Builder<ChatMetaData>()

                        .setQuery(sItemQuery, ChatMetaData.class)

                        .setLifecycleOwner(this)

                        .build();

You can't query across multiple levels like that. See Firebase Query Double Nested

So while your current data structure makes it easy to find the current users in a chat, it doesn't make it easy to find the current chats for a user.

For that you'll need to add an additional data structure. Something like:

user_chats: {

  uid1: {

    chatid1: true,

    chatid2: true

  }

  uid2: {

    chatid2: true,

    chatid3: true

  }

}

With this additional structure, you can easily find the chats for the current user by reading /user_chats/$uid.

Also see:

• Firebase query if child of child contains a value