How to retrieve an specific child in Firebase?

Question

The childByAutoId would be useful if you want to save in a node multiple children of the same type, that way each children will have its own unique identifier.

pet:{
    KJHBJJHB:{
      name:fluffy,
      owner:John Smith,
    },
    KhBHJBJjJ:{
      name:fluffy,
      owner:Jane Foster,
    }
}

Therefore, once I have that uID, and I want to retrieve an specific user using the his/her uID. How do I tell Firebase that I want that specific user? Because I create it and store it in Firebase, but then to read it, don't I need to know the value of the uID? Where do I get it from?

What function do I use to retrieve for example the second user using the uID?

Thanks in advance..

the title doesn't match the body.... you don't care about the value of the uid but you want to filter out all children where owner = XY instead right? — Daij-Djan, Jun 09 '16 at 21:15
I need to filter just one specific user. What I am trying to do is that when a user is selected from a tableView to udpate the profile information, I need to retrieve all information from that specific user and update it. But how can I get the path of that specific user if the path includes the key? if I want to reach that specific user I need to get that key again right? So that I can query using the unique ID — Jorge A Gomez, Jun 14 '16 at 22:30

score 1 · Answer 1 · edited Jun 20 '20 at 09:12

1

in the title u ask how to get rid so:: get the new ref's key property to get the aid created

FIRDatabaseReference *ref = parent.childByAutoID
NSString *uid = ref.key

BUT thats not what you want id say, so:

to filter out all children where owner = XY which you want I think:

FIRDatabaseReference *ref = your pets node 
FIRDatabaseQuery *allPets = [ref queryOrderedByChild:@"owner"];
FIRDatabaseQuery *specificPet = [allPets queryEqualToValue:@"XY"];

[specificPet observeEventType:FEventTypeChildAdded withBlock:^(FIRDataSnapshot *snapshot) {
  NSDictionary *dict = snapshot.value;
  NSString *key = snapshot.key;

  NSLog(@"key = %@ for child %@", key, dict);
}];

see: Query users by name or email address using Firebase (Swift)

edited Jun 20 '20 at 09:12

Community

1
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answered Jun 09 '16 at 21:24

Daij-Djan

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I need to filter just one specific child. I was trying to identify that specific child using the key. But I don't know where to get the key from so that I can use [queryEqualToValue:key] – Jorge A Gomez Jun 14 '16 at 22:11
im confused. how would you filter the element if you don't know the criteria? – Daij-Djan Jun 15 '16 at 20:53
Thank you! It was really useful! – user3435595 Jan 11 '17 at 00:35

How to retrieve an specific child in Firebase?

1 Answers1

BUT thats not what you want id say, so: