Flutter FireStore, Update TimeStamp with current time plus 5 minutes-CodePudding

Im writing data into Firestore DB, Im successfully writing it, as well then reading it based on TimeStamp order.

Now I would like to update TimeStamp of certain listId with current time plus 5 minutes, but can't figure it out, Was checking online, but only examples I was able to find were for other languages than dart, and couldn't figure it out.

Write Data

Future<void> addSentences(String listId) {
  final Sentences = FirebaseFirestore.instance.collection('Sentences');
  return Sentences.add({
    'listId': listId,
    'timeStamp': Timestamp.now(),
  });
}

Get oldest listId

 void getOldestListId() async {
      await for (var messages
          in FirebaseFirestore.instance.collection("Sentences").orderBy("timeStamp").limit(1).snapshots()) {
        for (var message in messages.docs.toList()) {
          print(message.data());
          Map we = message.data();
          print(we['listId']);
        }
      }
    }

Tried to update timeStamp with TimeStamp.now() plus 5 minutes, but can't figure how to do it

void update() async {
    var collection = FirebaseFirestore.instance.collection('sentences');
    collection
        .doc(listId) // <-- Doc ID where data should be updated.
        .update(timeStamp: Timestamp.now()   minutes(5));
  }

EDIT

Please note that listId is value Im saving into Firestore database and not document Id so it can't be inserted into .doc(listId), when I replace listId with document Id I see in Firestore DB .doc('idCopiedFromFireBaseConsole'), then I can update timeStamp with current time timeStamp, but still I don't know how to get document Id, I guess I should get document Id in getOldestListId() function, how could I get proper Id there?

 void getOldestListId() async {
      await for (var messages
          in FirebaseFirestore.instance.collection("Sentences").orderBy("timeStamp").limit(1).snapshots()) {
        for (var message in messages.docs.toList()) {
          print(message.data());
          Map we = message.data();
          print(we['listId']);
        }
      }
    }

This is how I can update timeStamp with current time 5 minutes

void update() async {
    var collection = FirebaseFirestore.instance.collection('sentences');    collection.doc('idCopiedFromFireBaseConsole').update({'timeStamp': DateTime.now().add(const Duration(minutes: 5))});

EDIT Now it works as I expected it to work, posting code for others with similar issue

Function to add data to FireStore

  Future<void> addSentences(String sentenceId) {
      final sentences = FirebaseFirestore.instance.collection('sentences');
      return sentences.add({
        'sentenceId': sentenceId,
        'timeStamp': Timestamp.now(),
      });
    }

Loop in which addSentences() is being used to add data to Firestore DB

   for (int i = 0; i <= 3; i  ) {
          //_sentenceList.length
          addChineseSentences(i.toString());
        }

Function to get oldest sentenceId

 late String _docId;
    void getOldestSentence() async {
      await for (var messages
          in FirebaseFirestore.instance.collection("sentences").orderBy("timeStamp").limit(1).snapshots()) {
        for (var message in messages.docs.toList()) {
          _docId = message.id;
          print(_docId);
          Map we = message.data();
          print(we['listId']);
        }
      }
    }

Function to update sentence timeStamp

void updateSentence() async {
  var collection = FirebaseFirestore.instance.collection('sentences');
  collection.doc(_docId) // <-- Doc ID where data should be updated.
      .update({'timeStamp': Timestamp.fromDate(DateTime.now().add(const Duration(minutes: 5)))});
}

CodePudding user response：

can you try with:

collection
    .doc(listId) // <-- Doc ID where data should be updated.
    .update(timeStamp: Timestamp.fromDate(DateTime.now().add(const Duration(minutes: 5))));

CodePudding user response：

That should be something like this:

collection
    .doc(listId)
    .update(timeStamp: Timestamp(Timestamp.now(). millisecondsSinceEpoch   5*60*1000);

The Timestamp.now(). millisecondsSinceEpoch gives you the current time in milliseconds, then we add 5 minutes in milliseconds to it, and convert the combined value back into a Timestamp.