check if a key exist firebase Android
12,524
Solution 1
Just needed to use this boolean function containsKey
so...
boolean check_rate = newPost.containsKey("upvotes");
if(check_rate == true){
String disp_rate = newPost.get("upvotes").toString();
rate_count.setText(disp_rate);
}
else{
System.out.println("FAILED");
}
This will fix the transaction if anyone is having the same issue with upvotes.
Solution 2
If you want to check if key exist or not, try this.
firebaseRef.orderByKey().equalTo(key).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.exists()) {
//Key exists
Log.d(TAG,""+key);
} else {
//Key does not exist
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
});
Author by
nothingness
Updated on June 13, 2022Comments
-
nothingness about 2 years
I want to check if a key exist in the firebase db. so for example, I want to look for the key "upvotes" to see if it exist or not.
Here is an exmaple, "upvotes" key does not exist in here:
Now I my attempt to check if the key "upvotes" is at this location:
Map<String, Object> newPost = (Map<String, Object>) ids.next().getValue(); if(newPost.get("upvotes").toString().equals("upvotes")){ disp_rate = newPost.get("upvotes").toString(); } else { disp_rate = "0"; }
My attempt is wrong, so how do I check if the key "upvotes" exist at this location.