Firestore数据库查询问题

您可以使用以下方法:

FirebaseFirestore.instance
  .collection('password_entries')
  .where('user_id ', isEqualTo: "BED3wChei4NEiDfQP72atUz2NU43")
  .get()
  .then((checkSnapshot) {
    // Document found - do something with it
    print(checkSnapshot.docs[0].data());
  });