Firebase Firestore : How to convert document object to a POJO on Android

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With the Realtime Database, one could do this :

MyPojo pojo  = dataSnapshot.getValue(MyPojo.Class);

as a way to map the object, how does one do this with Firestore?

CODE :

FirebaseFirestore db = FirebaseFirestore.getInstance();
        db.collection("app/users/" + uid).document("notifications").get().addOnCompleteListener(task -> {
            if (task.isSuccessful()) {
                DocumentSnapshot document = task.getResult();
                if (document != null) {
                    NotifPojo notifPojo = document....// here
                    return;
                }

            } else {
                Log.d("FragNotif", "get failed with ", task.getException());
            }
        });

With a DocumentSnapshot you can do:

DocumentSnapshot document = future.get();
if (document.exists()) {
    // convert document to POJO
    NotifPojo notifPojo = document.toObject(NotifPojo.class);
}

DocumentSnapshot, Class);as a way to map the object, how does one do this with Firebase Firestore : How to convert document object to a POJO on Android. Home » Android » java – Firebase Firestore : How to convert document object to a POJO on Android java – Firebase Firestore : How to convert document object to a POJO on Android Posted by: admin May 10, 2020 Leave a comment

Java

    DocumentSnapshot document = future.get();
if (document.exists()) {
    // convert document to POJO
    NotifPojo notifPojo = document.toObject(NotifPojo.class);
} 

Kotlin

 val document = future.get()
 if (document.exists()) {
    // convert document to POJO
     val notifPojo = document.toObject(NotifPojo::class.java)
  }

It is important to remember that you must provide a default constructor or you will get the classic deserialization error. For Java a Notif() {} should suffice. For Kotlin initialize your properties.

java: Firebase Firestore : How to convert document object to a POJO , Firestore makes it easy to to turn a document into a custom model class via reflection by Duration: 5:29 Posted: Apr 15, 2018 A QueryDocumentSnapshot contains data read from a document in your Cloud Firestore database as part of a query. A DocumentSnapshot contains data read from a document in your Cloud Firestore database. The data can be extracted with the getData () or get (String) methods. If the DocumentSnapshot points to a non-existing document, getData () and

Not sure if this is the best way to do it, but this is what I have so far.

NotifPojo notifPojo = new Gson().fromJson(document.getData().toString(), NotifPojo.class);

EDIT : i'm now using what's on the accepted answer.

Firestore Tutorial Part 7 - CUSTOM JAVA OBJECT, Returns the contents of the document converted to a POJO. Inherited Method Summary. From class com.google.firebase.firestore. There are two ways to retrieve data stored in Cloud Firestore. Either of these methods can be used with documents, collections of documents, or the results of queries: Call a method to get the data. Set a listener to receive data-change events. When you set a listener, Cloud Firestore sends your listener an initial snapshot of the data, and

QueryDocumentSnapshot, Reads the document referenced by this DocumentReference . FirebaseFirestore · getFirestore(). Gets the Cloud Firestore instance associated  Add a new document to a collection. In this case, Cloud Firestore automatically generates the document identifier. Create an empty document with an automatically generated identifier, and assign data to it later. This guide explains how to use the set, add, or update individual documents in Cloud Firestore. If you want to write data in bulk

DocumentReference | Google APIs for Android, Source Options; Custom objects See https://firebase.google.com/docs/​reference/js/firebase.firestore. You can turn your document back into a City object:. Firebase Cloud Firestore Database Tutorial Android Example. November 27, 2017. Firebase’s Firestore database is a NoSQL database hosted on cloud. Firestore database can be used in android, ios and web applications and can be accessed using various Firestore SDKs provided by Firebase. It can also be accessed using REST API.

Getting data | Firestore, Firestore: Objects inside list are not supported on serialization #6039 val accountRef = db.collection("accounts").document(accountId); accountRef.update(​"transactions", I've made this converter in Scala to save this in firebase: Firestore: support updating an individual field with pojo as a value #6711. The POJO type used to convert the documents in the list. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License , and code samples are licensed under the Apache 2.0 License .

Comments
  • Will this carryover the document id?
  • any idea what kind of deserializer this is using? i would like to configure some directives in my pojo for the deserializer if possible. Kind of like what Jackson provides. I'm trying to deserialize to an enum
  • I found an answer to keep document id : stackoverflow.com/a/46999773/2529315
  • Initializing the properties for my data class was the key for me. I had a parameter that was not initialised. Thank you for pointing this out.