Develop Reference

android: adding a new node

Need to add a new node "Completed" under the parent which will eventually contain all the information from the node "Requests" at end of the ride.
So basically, I need to create node "Completed" first but its not adding it.
database
{
"Requests" : {
"iowpxU6WKUWpzWJyfssSoOVCPFj2" : {
".priority" : "f8118c3k3v",
"destination" : "221 Prince William St",
"details" : {
"driver" : "nYIAHSYimJMHbMkXqDt9PQ0U3Nf2",
"location" : "27 Horsfield St",
"request status" : "accepted",
"ridePrice" : 3.75,
"rideStatus1" : "arrived at pickup",
"rideStatus2" : "rider in vehicle",
"rideStatus3" : "destination bound",
"rideStatus4" : "arrived at destination",
"rider" : "iowpxU6WKUWpzWJyfssSoOVCPFj2",
"riderPaid" : "true"
},
"Users" : {
"Drivers" : {
"nYIAHSYimJMHbMkXqDt9PQ0U3Nf2" : {
"driver" : "nYIAHSYimJMHbMkXqDt9PQ0U3Nf2",
"email" : "driver#me.com",
"name" : "driver",
"password" : "whatever",
"phone" : "5551212",
"rates" : "0"
}
},
"Riders" : {
"iowpxU6WKUWpzWJyfssSoOVCPFj2" : {
"avatarUrl" : "",
"email" : "rider#me.com",
"name" : "rider",
"password" : "whatever",
"phone" : "5551313",
"rates" : "0",
"riderId" : "iowpxU6WKUWpzWJyfssSoOVCPFj2"
}
}
}
}
addNewNode
private void addNewNode() { // TODO: ........ NOT ADDING NEW NODE :-| ..........
Toast.makeText(this, "addNewNode", Toast.LENGTH_LONG).show();
DatabaseReference newNode = FirebaseDatabase.getInstance().getReference("Completed");
newNode.child(riderId).push().addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Toast.makeText(DriverTripDetail.this, "addNewNode: onDataChange", Toast.LENGTH_LONG).show();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
Any assistance on how I can fix this would be greatly appreciated.

The Firebase Database stores values at paths. If there is no value, the path does not exist.
Your code creates a reference to /Completed/$pushID. but doesn't set any value, so the path doesn't get created. Something like this will work, since it sets a value:
newNode.child(riderId).push().setValue(true)

Firebase whitelist and recyclerView

{
"Events" : {
"events" : {
"-KT5UMQAhDHs1bB8bKLc" : {
"activity" : "biking",
"address" : "54°05'45.8\"N 28°19'02.9\"E, просп. Мира 9, Жодино, Беларусь",
"category" : "sport",
"creatorID" : "m11EvlP19OSbEz8XYl2MsNCwGXX2",
"date" : 1475431200689,
"forFriends" : true,
"info" : "вттчтвт",
"name" : "ьаьатвтвтт",
"uid" : "-KT5UMQAhDHs1bB8bKLc"
},
"-KUSsl7RaL-dVoDCoSYT" : {
"activity" : "picnic",
"address" : "Узденский район, Узденский район, Беларусь",
"category" : "entertainment",
"creatorID" : "1RXDSJzSEXakxvNdM41Ae3nbHN72",
"date" : 1477328400000,
"forFriends" : false,
"info" : "45",
"name" : "Test of date",
"uid" : "-KUSsl7RaL-dVoDCoSYT"
}
},
"FriendsOF" : {
"NuKweeGv8zTgt1Vi9RcU3i1u86U2" : {
"1RXDSJzSEXakxvNdM41Ae3nbHN72" : true
},
"m11EvlP19OSbEz8XYl2MsNCwGXX2" : {
"1RXDSJzSEXakxvNdM41Ae3nbHN72" : true
}
},
"Users" : {
"1RXDSJzSEXakxvNdM41Ae3nbHN72" : {
"email" : "*#gmail.com",
"name" : "Алексей Гвоздицкий",
"picture" : "*.jpg"
},
"NuKweeGv8zTgt1Vi9RcU3i1u86U2" : {
"email" : "*#gmail.com",
"name" : "Ольга Гвоздицкая",
"picture" : "*.jpg"
},
"m11EvlP19OSbEz8XYl2MsNCwGXX2" : {
"email" : "*#gmail.com",
"name" : "Егор Александров",
"picture" : "*.jpg"
}
}
}
I have a list of "events". Every "event" can be "forFiends" only (only if current user is in event creators "FriendsOF" list, then he can see this event. FriendsOF it's a whitelist). All availiable for current user events i want to represent in RecyclerView.
I am stucked. I can get all data snapshot and then filter on client side it. But it is not way of Jedi, because i load tonns of unnecessary data. Another solution is to deny acces to event if user should not see it. But i don't understand how to do it. My ref is mEventsRef = FirebaseDatabase.getInstance().getReference().child("Events").child("events"); And rule i can make for
"events":{
"$eventId":{".read":....}
}
So according to this guide i'll get empty recyclerView because of "error callback triggered with PERMISSION_DENIED"
Help me to solve my problem please!

Android Firebase, server side filtering for Recyclerview

Following is my firebase data structure
{
"ticketing" : {
"1476639649079-mahto" : {
"agentId" : 0,
"agent_status" : "1_Dispatched",
"approverId" : 0,
"contractorId" : 0,
"dateTime" : "16-10-2016 13:40 PM",
"priority" : "MEDIUM",
"requester" : {
"issue" : "issue 3",
"location" : "location 3",
"priority" : "Medium",
"shop" : "shop 3",
"site" : "site 3",
"userInfo" : {
"email" : "m#gmail.com",
"firstname" : "mahto",
"isLoggedin" : true,
"lastname" : "pancha",
"loggedin" : true,
"number" : "123123123",
"password" : "q",
"role" : "fieldagent",
"userid" : "2",
"username" : "q"
}
},
"requesterId" : 2,
"status" : "Incoming",
"ticketNumber" : "1476639649079-mahto"
},
"1476741838857-mahto" : {
"agentId" : 1,
"agent_status" : "1_Incoming",
"approverId" : 0,
"contractorId" : 0,
"dateTime" : "17-10-2016 18:03 PM",
"priority" : "HIGH",
"requester" : {
"issue" : "Description 3",
"location" : "Location 3",
"priority" : "HIGH",
"shop" : "shop 3",
"site" : "site 3",
"userInfo" : {
"email" : "m#gmail.com",
"firstname" : "mahto",
"isLoggedin" : true,
"lastname" : "pancha",
"loggedin" : true,
"number" : "123123123",
"password" : "q",
"role" : "fieldagent",
"userid" : "2",
"username" : "q"
}
},
"requesterId" : 2,
"status" : "Incoming",
"ticketNumber" : "1476741838857-mahto"
}
}
}
Database refrence
mDatabase = FirebaseDatabase.getInstance().getReference().child("ticketing");
mDatabase.orderByChild("agent_status").equalTo("1_Incoming");
and attached to recyclerview adapter
mAdapter = new FirebaseRecyclerAdapter<Ticket, AgentTicketHolder>(Ticket.class, R.layout.agent_ticket_cardview, AgentTicketHolder.class, mDatabase) { .. }
My expected result is that i will get only one node i.e 1476741838857-mahto which has agent_status value equal to 1_Incoming.
But i'am getting both the nodes in my recylerview.

When you call filtering methods, the Firebase SDK returns a new object for the resulting query. So you need to capture the reference to that object and pass that into the adapter:
mDatabase = FirebaseDatabase.getInstance().getReference().child("ticketing");
Query query = mDatabase.orderByChild("agent_status").equalTo("1_Incoming");
mAdapter = new FirebaseRecyclerAdapter<Ticket, AgentTicketHolder>
(Ticket.class, R.layout.agent_ticket_cardview, AgentTicketHolder.class, query) { .. }

How to display data that depends on other entity?

Having the following data:
"animals" : {
"a1" : {
"name" : "Dog"
},
"a2" : {
"name" : "Cat"
},
"a3" : {
"name" : "Cow"
}
},
"users" : {
"u1" : {
"favAnimals" : {
"a1" : true,
"a2" : true
},
"name" : "Danilo"
}
}
How can I display for the user, using the FirebaseListAdapter, the complete list of animals, highlighing user's favorite animals?
Is it possible to query and join them, to get a Database Reference that would watch for changes both in "/animals" and "/users/$uid/favAnimals" and return something like:
"animals" : {
"a1" : {
"name" : "Dog",
"fav" : true
},
"a2" : {
"name" : "Cat"
"fav" : true
},
"a3" : {
"name" : "Cow"
}
}

How to use orderByKey() with DataSnapshot?

I am populating a list of programs in a RecyclerView. Now i need to sort the programs by the time added. So i thought of adding a timestamp object to each program.
But i read that the PushID is also generated from a timestamp. So i tried to use the orderByKey(). But i can't figure out that how can i use the query with the userSnapshot?
CODE
public void FetchData() {
ProgramItemList.clear();
mRef.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) {
for (DataSnapshot programSnapshot : userSnapshot.getChildren()) {
program = programSnapshot.getValue(Program.class);
ProgramItem item = new ProgramItem();
String pushID = programSnapshot.getKey();
item.setID(pushID);
item.setName(program.getTitle());
ProgramItemList.add(item);
}
}
}
mAdapter.notifyDataSetChanged();
}
#Override
public void onCancelled(FirebaseError firebaseError) {
}
});
}
JSON
{
"subscriptions" : {
"han#gmail,com" : {
"-KDnhRwHjssOejrqyenP" : {
"category" : "Strength",
"goal" : "This workout can be done while on the phone!",
"length" : 1,
"title" : "Hello Workouts",
"weeks" : {
"week1" : [ "High Knees", "Jumping Jacks", "Burpees" ]
}
},
"-KDni3TN4NMyGXePyp92" : {
"category" : "Strength",
"goal" : "This workout can be done by a BABUJI",
"length" : 1,
"title" : "Indian Workouts",
"weeks" : {
"week1" : [ "Diamond Pushups", "Jackknives", "Pushups" ]
}
}
},
"obama#gmsil,com" : {
"-KDnfjROKeFAL9wccsxY" : {
"category" : "Mobility",
"goal" : "afternoon body weight workout",
"length" : 1,
"title" : "Afternoon HiiT",
"weeks" : {
"week1" : [ "High Knees", "Squats", "Lunges", "Diamond Push-ups", "Lying Triceps Lifts" ]
}
},
"-KDps90Dn6XtJc6Co00b" : {
"category" : "Strength",
"goal" : "goal",
"length" : 1,
"title" : "title",
"weeks" : {
"week1" : [ "Diamond Pushups", "Spiderman Push-up", "Wide Arm Push-ups", "Burpee Pushups" ]
}
}
}
}
}