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Getting data not defined error while accessing data from Firebase Firestore


By : Neil Harner
Date : September 16 2020, 08:00 PM
wish helps you I have Collection named products with 4 documents. , Try putting let before data like this:
let data = doc.data()
code :


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Firebase Firestore: Returning NullPointer Exception when accessing data


By : Zach Gergely
Date : March 29 2020, 07:55 AM
should help you out This is happening because your WeightsLifted class does not have the public no-argument constructor. When the Firebase Cloud Firestore SDK deserializes objects coming from the database, it requires that any objects in use to have this public no-argument constructor that I was talking about. This constructor can be used to instantiate the object of the class. Fields in the objects are set by using public setter methods or direct access to public members.
To solve this, just add the following constructor to your class:
code :
public WeightsLifted() {} //Needed for Firebase

Accessing data within an inner function in Java with FireBase/FireStore


By : user2001968
Date : March 29 2020, 07:55 AM
I hope this helps . That is an asynchronous call (it launches a background process to do the Firebase query, and once that is done it executes your onComplete listener), so you can't expect to have the data in hand immediately after making the database call. For example, if your function looks like
code :
void getData() {
    final List<MyData> list = new ArrayList<>();

    db.collection("cities")
        .get()
        .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()) {
                    for (QueryDocumentSnapshot document : task.getResult()) {
                        Log.d(TAG, document.getId() + " => " + document.getData());
                        list.add(new MyData(document.getData()));
                    }
                } else {
                    Log.d(TAG, "Error getting documents: ", task.getException());
                }
            }
        });

    Log.d(TAG, "List size = " + list.size()); // will print 0
    // list will be empty here, the firebase call will take hundreds 
    // to thousands of milliseconds to complete
}
void getData() {
    db.collection("cities")
        .get()
        .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()) {
                    List<MyData> list = new ArrayList<>();
                    for (QueryDocumentSnapshot document : task.getResult()) {
                        Log.d(TAG, document.getId() + " => " + document.getData());
                        list.add(new MyData(document.getData()));
                    }
                    processData(list);
                } else {
                    Log.d(TAG, "Error getting documents: ", task.getException());
                }
            }
        });
}

void processData(List<MyData> data) {
    // do stuff with the data, or make a copy, or otherwise share it
    // with the rest of your program
}

Android Firebase Firestore: Get data from deep in Firestore document


By : user2204451
Date : March 29 2020, 07:55 AM
I hope this helps you . As you can see from the API documentation, getData() returns a Map of all the fields and their values in the document. You need to dive into these values.
Also note that each field value in a document will surface as an appropriate Java type that describes each value. So, if a field contains an object, the field value type will be a Map whose keys and values are going to be the properties and values of that object. If a field value contains an array, You'll get a List that contains each value of the array.

How do I handle my data model class to get Firebase Firestore data into recyclerView?


By : user2809722
Date : March 29 2020, 07:55 AM
Any of those help The automatic mapping that the Firebase SDK can do from a Firestore document to a Java object, requires that each field name from the document matches a property name in the Java class. It has no mechanism to deal with dynamic fields, such as the timestamps in your example.
So you will have to do your own conversion. For that you can use the public T get (FieldPath fieldPath, Class valueType) or public T get (String field, Class valueType) method, which allow you to get an object from a specific field that you specify. So you will have to loop over the timestamp fields, but after that the Firebase SDK can map the severity, symptom, and timestamp properties to the object.

Javascript store (firebase)firestore data always overwrite the first part data


By : user3240840
Date : March 29 2020, 07:55 AM
I wish this help you I am use the html, javascript and firebase to create the message board , and store the data. But I need to save the data , if the userID(ex:0001) is the same, it is can create the object of , Change this:
code :
db.collection("suggest").doc("0001").set(userData2,{merge: false})
          .then(function() {
              console.log("Successfully written!");
          })
          .catch(function(error) {
              console.error("Error writing: ", error);
          });
db.collection("suggest").add(userData2)
          .then(function() {
              console.log("Successfully written!");
          })
          .catch(function(error) {
              console.error("Error writing: ", error);
          });
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