How to make changes to a DocumentSnapshot/QueryDocumentSnapshot (FlutterFire)

Question

I'm trying to make changes to a specific field in a DocumentSnapshot, but I cant figure out how to get the update method to work. I can't even find any documentation to help me figure it out.

whatever.data().update("Availability", (newValue) => whatever);

whatever is a documentsnapshot,'Availabilty' is the field I want to update, and 'newValue' is the value I want to update the field in the fetched object itself and not in Firestore.

Answer 1

The DocumentSnapshot has a reference property which is the DocumentReference of this snapshot.

Then you can update the document like this:

whatever.reference.update({Availability: "NewValue"})

Edit: OP wanted to updated local variable only and not the data in Firestore which can be done by assigning the data to a variable and update it.

var myData = whatever.data()
myData['property'] = 'value'

Answer 2

Try this

whatever.doc().update({
        "Availability": newValue,
      });

Answer 3

FirebaseFirestore.instance
        .collection('YOURCOLLECTION')
        .doc(DOCUMENTID)
        .update({'Availability': newValue}).then((value) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Success'),
          ),
        );
    }).onError((error, stackTrace) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Error while updating document'),
        ),
      );
    });

YOURCOLLECTION is the name of your collection and DOCUMENTID is your document Id for which you want to update the data.