How to check loggedinuser email in firestore database? Flutter - firebase

Question

Here is my code;
class TaskList extends StatefulWidget {
#override
_TaskListState createState() => _TaskListState();
}
class _TaskListState extends State<TaskList> {
final _auth = FirebaseAuth.instance;
void getCurrentUser() async {
try {
final user = await _auth.currentUser;
if (user != null) {
loggedInUser = user;
}
} catch (e) {
print(e);
}
}
#override
void initState() {
// TODO: implement initState
super.initState();
getCurrentUser();
}
#override
Widget build(BuildContext context) {
return StreamBuilder(
stream: _firestore.collection('tasks').snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return Padding(
padding: EdgeInsets.only(top: 50, bottom: 50),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
"There is nothing to show for now!",
style: GoogleFonts.poppins(fontSize: 20),
),
InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => AddTask()),
);
},
child: Container(
height: 80,
width: 80,
decoration: BoxDecoration(
color: Colors.blueAccent,
gradient: LinearGradient(
begin: Alignment.topRight,
end: Alignment.bottomRight,
colors: [Colors.blue, Colors.blueAccent],
),
shape: BoxShape.circle,
),
child: Center(
child: Icon(
Icons.add,
size: 35,
color: Colors.white,
),
),
),
),
],
),
);
} else {
return Padding(
padding:
EdgeInsets.only(top: 50, bottom: 50, left: 20, right: 20),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expanded(
child: ListView(
children:
snapshot.data!.docs.map((DocumentSnapshot document) {
Map<String, dynamic> data =
document.data()! as Map<String, dynamic>;
return Card(
child: Padding(
padding: EdgeInsets.only(
top: 10, bottom: 10, left: 10, right: 10),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Expanded(
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(data['title'],
style: kNormalTextStyle),
Text(
data['text'],
style: kNormalTextStyle,
),
Text(
data['date'],
style: kNormalTextStyle,
),
Text(
data['time'],
style: kNormalTextStyle,
),
],
),
),
IconButton(
icon: Icon(Icons.delete),
onPressed: () {},
)
],
),
),
);
}).toList(),
),
),
InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => AddTask()),
);
},
child: Container(
height: 80,
width: 80,
decoration: BoxDecoration(
color: Colors.blueAccent,
gradient: LinearGradient(
begin: Alignment.topRight,
end: Alignment.bottomRight,
colors: [Colors.blue, Colors.blueAccent],
),
shape: BoxShape.circle,
),
child: Center(
child: Icon(
Icons.add,
size: 35,
color: Colors.white,
),
),
),
),
],
),
);
}
});
}
}
What I'm tryin to do is if there is a task with email as same as loggedInUser, I want to show it AllTasks page.
return StreamBuilder(
stream: _firestore.collection('tasks').snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData)
In this code part, I can check if there is any data in snapshot however, I want to check if there is a task with mail as same as loggedInUser.email. Is there a way to check if there is a task with email as same as loggedInUser?
loggedInUser implementation:
User? loggedInUser;
Also how I add data to firestore database:
ElevatedButton(
child: Text("Add Task"),
onPressed: () {
String formatedDate =
DateFormat("MM-dd-yyyy").format(_selectedDate!);
String formattedTime =
DateFormat("HH:mm").format(_dateTime!);
_firestore.collection("tasks").add({
'title': _titleController.text,
'text': _textController.text,
'date': formatedDate,
'time': formattedTime,
'email': loggedInUser!.email,
});
Navigator.pop(context, _firestore);
},
),

Answer 1

If you only want to show the tasks for the logged in user, it is best to use a query to only read those tasks from the database.
stream: _firestore.collection('tasks').where('email', isEqualTo: loggedInUser!.email).snapshots(),
Also see the FlutterFire documentation on filtering data through queries.