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)

Android - Save list of object property with specific key on Firebase

Let's consider a "UserBean" with a property "emails" that is an ArrayList<EmailBean>.
When saved in Firebase it's like :
"users" : {
"$userID" : {
"emails" : [
"0" : {
"type" : "first",
"address" : "google#google.com",
"private" : true
},
"1" : {
"type" : "second",
"address" : "firebase#firebase.com",
"private" : false"
}
],
"name" : "Mitch"
}
}
So is it possible to achieve something like this :
"users" : {
"$userID" : {
"emails" : [
"first" : {
"address" : "google#google.com",
"private" : true
},
"second" : {
"address" : "firebase#firebase.com",
"private" : false
}
],
"name" : "Mitch"
}
}
I would prefer to not having to save each address one at a time.
Maybe there's an annotation to tells Firebase to use this property as a key ?
Regards.

I recomend you using the code below:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference emailsRef = rootRef.child("users").child(userId).child("emails");
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String type = ds.child("type").getValue(String.class);
ds.child("type").getRef().getParent().setValue(type);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
emailsRef.addListenerForSingleValueEvent(eventListener);
What have i tried with this code? So in order to achieve what you want, first of all we got the value of your type key. Then we get a step up in the tree and set the partent with the value of your type key for each particular node.
Having the value of type in stead of 0, 1 and so on, to get the work done, just remove the type key, from each node using removeValue() method directly on the reference.

Cannot update one field on firebase - Android

I cannot update one field on firebase, when i do delete all the others fields of the database
CODE
String URL_EVENT_REFERENCE = "eventmodel";
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference databaseEvent = database.getReference(URL_EVENT_REFERENCE);
String key = "KTVAt0NM1Y5v32YxSqc";
Map<String, Object> eventValues = new HashMap<>();
eventValues.put("name", "new name");
Map<String, Object> childUpdates = new HashMap<>();
childUpdates.put(key, eventValues);
databaseEvent.updateChildren(childUpdates);
This is the JSON tree, on the eventmodel y want to update the -KTVAt0NM1Y5v32YxSqc and change the name hola to new name
{
"eventmodel" : {
"-KTVAt0NM1Y5v32YxSqc" : {
"info" : "",
"limit" : 2,
"members" : {
"Mn7gZ7rn5XRGU1HXujbbSQv05BH2" : true
},
"name" : "hola",
"pic" : "default_publish_img",
"place" : {
"address" : "Barcelona, España",
"latitude" : 41.3850639,
"longitude" : 2.1734034999999494
},
"status" : true,
"timeCurrentEnd" : "7/10/2016 21:27",
"timeCurrentStart" : "7/10/2016 20:27",
"uidLeader" : "Mn7gZ7rn5XRGU1HXujbbSQv05BH2"
}
}
}

You are putting new empty object with only name field..
try to update only the name instead of the whole object
databaseEvent.child(key).child("name").setValue("new name");

Order data by child node's value - Firebase

I'm trying to retrieve all recipes favorited by a user using this code, but no data is retrived
recipesQuery = mDatabase.child("recipes").orderByChild("favoritedBy").equalTo(getId());
This is my Structure:
{
"-KNnrgEmF8qCpsWiIMW4" : {
"favoriteCount" : 4,
"favoritedBy" : {
"0ZtxMXZ8iDV4u0POxu8n6cIwCX33" : true
},
"name" : "Recipe 1",
"recycleCount" : 0,
},
"-KNvq6Ts8RYxc0-O3B2t" : {
"favoriteCount" : 2,
"favoritedBy" : {
"0ZtxMXZ8iDV4u0POxu8n6cIwCX33" : true
},
"name" : "Recipe 2",
"recycleCount" : 0,
}
}
If I remove the .equalTo() method all data is retrieved, but thats not what I want.
What am I doing wrong?

There's currently no method to filter a query based on other objects than String, Boolean, or Double.
What I suggest is to restructure your database to something like this
{
"users": {
"userId1" : {
"name" : "User1",
"favorites": {
"-KNnrgEmF8qCpsWiIMW4" : true,
"-KNvq6Ts8RYxc0-O3B2t" : true
}
},
"userId2" : {
"name" : "User2",
"favorites": {
"-KNvq6Ts8RYxc0-O3B2t" : true
}
}
},
"recipes": {
"-KNnrgEmF8qCpsWiIMW4" : {
"favoriteCount" : 4,
"name" : "Recipe 1",
"recycleCount" : 0,
},
"-KNvq6Ts8RYxc0-O3B2t" : {
"favoriteCount" : 2,
"name" : "Recipe 2",
"recycleCount" : 0,
}
}
}
Then it's easier to get the recipes favorited by specific user.
mDatabase.child("users").child(userid).child("favorites")

Firebase Retrieve Limited Messages by Auto assigned timestamp

I wish to retrieve only the top 50 messages a user has within the database, with schema:
"individualMessages" : {
"99e4989b-a046-4c5f-9478-5ebd8bdc3ded" : {
"a96da7b1-7c4e-44bc-b82e-fc75bed52bcd" : {
"-KBUjngi9JStE-k4RMUJ" : {
"from" : "a96da7b1-7c4e-44bc-b82e-fc75bed52bcd",
"messageText" : "hey",
"timeSent" : "2016-02-26 17:40:46"
},
"-KBYhsRONfGxVI7Ysb3F" : {
"from" : "a96da7b1-7c4e-44bc-b82e-fc75bed52bcd",
"messageText" : "pool",
"timeSent" : "2016-02-27 12:10:52"
}
},
"fdb17f3a-7b7d-4aa5-9a0b-b9fb33c349de" : {
"-KBcYtQ5gD-drFZqz_MU" : {
"from" : "fdb17f3a-7b7d-4aa5-9a0b-b9fb33c349de",
"messageText" : "ouu",
"timeSent" : "2016-02-28 10:46:52"
},
"-KBcYw24M-9-7H5A3czD" : {
"from" : "fdb17f3a-7b7d-4aa5-9a0b-b9fb33c349de",
"messageText" : "gsf",
"timeSent" : "2016-02-28 10:47:03"
}
However, simply using:
individualMessageMyPath = myFeastFirebase.child("individualMessages").child(.....
getTop50Messages = individualMessageMyPath.limitToLast(5);
getTop50Messages.orderByChild("timeSent").addChildEventListener(mainMessagingListener);
Returns all messages on that node.
Reviewing the documentation this should work, however it does not.
What is missing?