How to know the type of change of DocumentChange using Cloud Firestore in Flutter

user_11913272 0
Viewed 1120

i have a listener for any change happens it works fine but i can't get the type of change is it Delete, Add or modify 

Firestore.instance.collection('groups').snapshots().listen((data) {
        data.documentChanges.forEach((change) {
          print('documentChanges ${change.document.data}');
        });
      });
google-cloud-firestore firebase dart flutter
1 Answers

According to this Google Cloud Firestore API documentation, you can access to the type of DocumentChange with getType()

In case of the Flutter plugin that would be the property type (you can check the DocumentChange class of the plugin here: document_change.dart). It contains this enum for the type property:

/// An enumeration of document change types.
enum DocumentChangeType {
  /// Indicates a new document was added to the set of documents matching the
  /// query.
  added,

  /// Indicates a document within the query was modified.
  modified,

  /// Indicates a document within the query was removed (either deleted or no
  /// longer matches the query.
  removed,
}

/// The type of change that occurred (added, modified, or removed).
final DocumentChangeType type;

So in your case you should be able to do:

change.type == DocumentChangeType.added
user_119384620
Related