Question

I am was building a flutter application with some Sqflite and firestore database Now I have ran into a problem that whenever I run the application. I get snapshot.hasdata to true for the first time and than I get snapshot.hasdata to false in a second. I am attaching the screenshots of both console and the code here

StreamBuilder(
  stream: FirebaseFirestore.instance
      .collection( ADs CommonGroup )
      .orderBy("id", descending: true)
      .orderBy("id", descending: true)
      .where( id , isEqualTo: databaseLogin[0]["number"])
      .snapshots(),
  builder: (
    BuildContext context,
    AsyncSnapshot<QuerySnapshot> snapshot,
  ) {
    print( snapshot does not have data ${snapshot.hasData} );
    print(databaseLogin[0]["number"]);

如今,这本小册子已经出版。

I/flutter (16812): snapshot does not have data false
I/flutter (16812): +923335885631
I/flutter (16812): snapshot does not have data true
I/flutter (16812): +923335885631
I/flutter (16812): snapshot does not have data false
I/flutter (16812): +923335885631

What can I do code with Console

我想到的是头痛。如果有数据,数据应当恢复到以前一样的水平。

Answer 1

采用<代码>AsyncSnapshot的第一步是处理错误。简单:

builder: (
  BuildContext context,
  AsyncSnapshot<QuerySnapshot> snapshot,
) {
  if (snapshot.hasError) {
    print(snapshot.error);
    return Text("ERROR: ${snapshot.error}");
  }
  print( snapshot does not have data ${snapshot.hasData} );
  print(databaseLogin[0]["number"]);
  ...

这可能告诉你问题的原因。

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