Flutter cloud_firestore 持久性即使启用也不起作用

Question

我对此进行了大量搜索。但是，我的 flutter 应用程序在活动网络上运行良好。我为 cloud_firestore 启用了持久性，但它显示此错误：

[cloud_firestore/unavailable] The service is currently unavailable. This is a most likely a transient condition and may be corrected by retrying with a backoff.

我的示例代码：

FirebaseFirestore db = FirebaseFirestore.instance;
  db.settings = Settings(persistenceEnabled: true, cacheSizeBytes: 10000000);

final ref = db.doc("some_collection/some_doc");

try{
  ref.update({"key": value});
} catch(error) {
  print(error.toString());
}

我的pubspec.yaml:

firebase_messaging: ^8.0.0-dev.14
firebase_core: ^0.7.0
firebase_auth: ^0.20.0+1
flutter_local_notifications: ^3.0.3
cloud_firestore: ^0.16.0

Answer 1

所以，我的情况是，每当我的应用程序收到来自客户端的传入消息时，我都必须将一些数据上传到 firestore。这就是为什么我需要两个服务，一个是后台消息接收器和 firestore 持久性。

我在做什么：

首先尝试从 firestore 读取一些数据，然后我需要再次将传入的消息数据放入 firestore。像这样：

FirebaseFirestore db = FirebaseFirestore.instance;
db.settings = Settings(persistenceEnabled: true, cacheSizeBytes: 10000000);

// payments ref
final paymentRefs = db
     .collection("payments")
     .where("trxID", isEqualTo: "123456")
     .where("amount", isEqualTo: 50)
     .limit(1);

try {
   final paymentGet = await paymentRefs.get();
     if (paymentGet.size > 0) {
       final paymentData = paymentGet.docs[0];
       // check for payment existence with the trxID
       // if exists, then validate and update
       if (paymentData.exists) {
        final paymentAmount = paymentData.data()['amount'];
        final exactPaymentRef = db.collection("payments").doc(paymentData.id);

         // for individual and if amount matches
         if (amount == paymentAmount) {
            exactPaymentRef.update({
              "paid": true
            });
         }
      } else {
        // payment ref not found with trxID
        // so upload the trxID to reqTrxID collection
        db.doc("reqTrxID/$trxID").set({
          "createdAt": new DateTime.now().millisecondsSinceEpoch,
          "phoneNumber": phoneNumber,
          "amount": amount
        });
     }
  }
} catch (error) {
    print("error triggering to firestore: ${error.toString()}");
}

我的错误是，我从 firestore 做了一些额外的提取。并且作为 firebase 文档 firestore 持久性不会在任何异步（try/catch，承诺，async/await）方式上工作（我很高兴这样做:)）。

我是如何解决这个问题的：

FirebaseFirestore db = FirebaseFirestore.instance;

  db.doc("reqTrxID/$trxID").set({
    "createdAt": new DateTime.now().millisecondsSinceEpoch,
    "phoneNumber": phoneNumber,
    "amount": amount
  });

我只是上传我必须的值，然后我将所有必要的检查发送到 文档创建触发器上的云函数。这解决了我的问题。

Flutter cloud_firestore 持久性即使启用也不起作用

Flutter cloud_firestore persistence is not working even if it is enabled

persistence

dart

flutter

google-cloud-firestore

我在做什么：

我是如何解决这个问题的：