Question 75320 in Flutter Question posted in
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Firestore database increase read operation when i update a document which i have already have it? – Flutter

I use getDocData function for get one document.

 Future getDocData(String docPath) async {
    try {
      print(docPath);
      final response = await fireStore.doc(docPath).get();
      return response.data();
    } catch (e) {
      throw UnimplementedError(e.toString());
    }
  }

After i got document i updated same document with updateDocument function.

 Future updateDocument<T>(docPath, docField, data) async {
    try {
      return await fireStore.doc(docPath).set(
        {docField: data},
        SetOptions(
          merge: true,
        ),
      );
    } catch (e) {
      throw UnimplementedError(e.toString());
    }
  }

when operation done. i expect on firebase usage dasboard one read and one write operation happen but I see two read and one write operation.Is there anyway solve this issue or is it okay?

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2

Answers


  1. 0

    you can Use update() instead of set() with SetOptions(merge: true) can be a good solution for reducing the number of read operations,like this

    Future updateDocument<T>(docPath, docField, data) async {
  try {
    return await fireStore.doc(docPath).update(
      {docField: data},
    );
  } catch (e) {
    throw UnimplementedError(e.toString());
  }
}
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  2. 0

    I have tried updating the document with set and update and observed the reads and writes like below :

    With set() I got two reads and one write in the dashboard. set() with merge instead of updating existing documents will create a new document copying existing fields while retaining the same doc id. That is where I got one extra read operation.

    With update() it is updating the existing document and will get one read and one write operation.

    The docfield passed as value should be a key, which means it needs to be passed with [] brackets. Take a look at the sample code.

    Future updateDocument<T>(docPath, docField, data) async {
    try {
      return await fireStore.doc(docPath).update(
        {[docField]: data}, // ⇐ notice
      );
    } catch (e) {
      throw UnimplementedError(e.toString());
    }
  }
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