FIRDatabaseQuery: how to do an inner join

Question

I\'m trying to do an inner join on a FIRDatabaseQuery object.

below is the database structure. I have some posts that are linked to post-comments. I am trying to get

Answer 1

You will need to work with nested firebase calls. You can find a javascript example in this question but your swift code should look like the following:

ref.child("posts").observeEventType(.ChildAdded, withBlock: { (snapshot) in
    if let postId = snapshot.key as! String {
      let commentsRef = ref.child("post-comments")  
      commentsRef.child(postId).queryOrderedByChild("uid").queryEqualToValue(userId).observeSingleEventOfType(.Value, withBlock: { (snapshot) in
            for child in snapshot.children.allObjects as [FDataSnapshot] {
               print(child.value)     
            }
        }) { (error) in
            print(error.localizedDescription)
        }
      }
})