I have been trying fetch data from firebase and storing it in a dataModel using completion handler like this static var dataModels = [DataModel]() static func fetchData(completion: @escaping () -> Void) { let ref = Database.database().reference().child("data") ref.observe( .value, with: { snapshot in guard let value = snapshot.value as? [[String: Any]] else { return } for… Read More How to get value from inside closure to set to a local variable

Whenever I am trying to query some data in order to delete a folder in Realtime Database, I get the following warning: Your data will be downloaded and filtered on the client. Consider adding ".indexOn": "id" at /comments/evChargers/D6A3D94D-1F2F-467B-A6C5-F6D9BF7D1C02/AKsxbJAifSbsIhFONMSFT6UTarS2 to your security rules for better performance However, the values D6A3D94D-1F2F-467B-A6C5-F6D9BF7D1C02 and AKsxbJAifSbsIhFONMSFT6UTarS2 are not constant and… Read More How to add an .index in Realtime Database when the folders are not constant?

When I try to iterate over the children in a DataSnapshot it throws a RangeError. This is the code that I have: Map<String, Object> mapOfMaps(DataSnapshot snapshot) { Map<String, Object> map = <String, Object>{}; for (var child in snapshot.children) { if (child.children.isNotEmpty) { map[child.key!] = mapOfMaps(child); } else { map[child.key!] = child.value!; } } return map;… Read More Iterating over children of a DataSnapshot throws exception

I have a few collections in a Firebase Realtime Database that are structured like this:: SomeCollectionName { randomKey1: userId1, randomKey2: userId2, randomKey3: userId3, randomKey4: userId1, randomKey5: userId1 } I want to query SomeCollectionName where the values are equal to userId1, but am having a hard time figuring out how to get those values without knowing… Read More How can I query Firebase Realtime Database by value when it is only a list of key:values?

I am retrieving longitude and latitude values of each user from firebase but problem is that i want to add that values of each user in one list so there are many list that’s why I’m using arraylist of arraylist. So for first user longitude = 12345 , latitude = 23456 and for 2nd user… Read More How to add values in arraylist of arraylist?

I am working on an App that allows the student to register using their registration number. the registration number is like 17/csc/001 till infinity. The student registration number will saved as a child of that firebase reference but the issue I am having is that firebase splits the registration number into three places due to… Read More how to stop slash from splitting the firebase database child

I’m coding a Tic Tac Toe, and while executing it crashes when I tried to read a value from the database. I’m getting the following error: com.google.firebase.database.DatabaseException: Failed to convert value of type java.lang.Long to String The line where it crashes is the following : canPlay = Long.parseLong(snapshot.getValue(String.class)); The function is the following: refPeutJouer.addValueEventListener(new ValueEventListener()… Read More Failed to convert value of type java.lang.Long to String – Android Studio – Firebase Realtime Database

My PoIs class: public class PoIs { private Integer location_id; private String location_name; private String location_address; public PoIs() {} public PoIs(Integer location_id, String location_name, String location_address) { this(); this.location_id = location_id; this.category_id = category_id; this.location_name = location_name; this.location_address = location_address; } public Integer get_location_id() { return location_id; } public void set_location_id(Integer location_id) { this.location_id =… Read More All my firebase field get automatically an underscore on front

I have the following code: public void signOn(String id, String password){ usersReference.addListenerForSingleValueEvent(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { boolean valid = false; for(DataSnapshot singleSnapshot : dataSnapshot.getChildren()){ String key = singleSnapshot.getKey(); if (key.equals(id)) { singleSnapshot.getValue()//THIS LINE THIS LINE Intent myIntent = new Intent(WelcomePage.this, MainActivity.class); myIntent.putExtra("key", key); WelcomePage.this.startActivity(myIntent); } } } @Override public void onCancelled(DatabaseError… Read More Get value from list of objects Firebase Android Studio

So I know how to use transaction to increment or decrement a number. But how do I know who sends this number? For example, there’s a plate of cookies and everyone grab one, almost if not at the same time. How do I get the person’s id or name that grabs the last cookie? >Solution… Read More Firebase Realtime – Transaction with additional variables