Flutter Firestore插件无法结合where和isEqualTo来获取数据 [英] Flutter firestore plugin can't able to fetch data with combination of where and isEqualTo

问题描述

我在Firestore中有一个名为 trips的集合。数据格式如下：

I have a collection by name "trips" in Firestore. The data format is something like this

I正在尝试使用以下代码访问该收藏集的文档。

I'm trying to access documents of that Collection by using below code.

第一种方式

try {
  Firestore.instance
      .collection("trips")
      .where("createdByName", isEqualTo: "Suresh")
      .snapshots
      .listen((data) => print('Firestore response1: ${data.documents}'));
} catch (e){
  print('Caught Firestore exception1');
  print(e);
}

第二种方式

try {
  Firestore.instance.collection("trips").where("createdByName", isEqualTo: "Suresh").getDocuments().then((data) {
    print('Firestore response2: , ${data.documents}');
  });
} catch (e){
  print('Caught Firestore exception2');
  print(e);
}

但是，以上两种方法均无效。不知道我在做什么错。

But, none of the above two ways is working. Don't know what I'm doing wrong.

每当删除 where（ createdByName，isEqualTo： Suresh）部分运行正常。但是，当我包括该部分查询的那一刻返回空结果。

One thing I've noticed whenever I'm removing the where("createdByName", isEqualTo: "Suresh") part from the query it's working fine. But, the moment I include that part query is returning an empty result.

推荐答案

好吧，两天后这很愚蠢的事情...这是问题的答案... .where（'trip.createdByName'，isEqualTo： Suresh）

Ok, after two days of breaking my brain for this silly thing... this is the answer to the issue... .where('trip.createdByName', isEqualTo: "Suresh")

然后，完整的查询就是这样...

And, the full queries are like this...

第一种方式

Firestore.instance.collection('trips')
  .where('trip.createdByName', isEqualTo: "Suresh")
  .snapshots.listen(
      (data){
        data.documents.forEach((doc) => print( 'Firestore response1 : ${doc.data.toString()}' ));
      }
  );

第二种方式

Firestore.instance.collection("trips")
  .where("trip.createdByName", isEqualTo: "Suresh")
  .getDocuments().then((string) {
    string.documents.forEach((doc) => print("Firestore response2: ${doc.data.toString()}" ));
  });

希望，这会有所帮助。 ：）

Hope, this will be a help. :)

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