flutter check if data exists in firestore - flutter

Question

I've been trying to check if user selected data matches with my firestore data.
onPressed: () async{
await Navigator.of(context).push(MaterialPageRoute(builder: (context) => Checker (
from: fromSel,
to: toSel,
)));
},
and in the second page i used
StreamBuilder(
stream: Firestore.instance
.collection('Schedules')
.where('from', isEqualTo: from)
.where('to', isEqualTo: to)
.snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot){
if (!snapshot.hasData)
return Center(child: CircularProgressIndicator());
return ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index){
DocumentSnapshot power = snapshot.data.documents[index];
print(power['from']);
print(power['to']);
return Container(
height: 200,
width: MediaQuery.of(context).size.width,
child: Column(
children: [
Text(power['from']),
Text(power['to'])
],
),
);
}
);
}),
so the problem i'm getting is it's not displaying the value when i use .where('from', isEqualTo: from) but it works when i use .where('from', isEqualTo: 'Adama'). and also works with .where('from', isEqualTo: from) when i instantiate from value manually like String from = 'Adama'
can you please tell me what the problem is?
and below is my firestore structure
below is the whole code for the checker (renamed to search)
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:demo/BookingPages/budget.dart';
import 'package:demo/Lists/trip.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
class Search extends StatefulWidget {
final from, to, seat, adult, child, infant;
final DateTime arrive, depart;
Search(
{Key key, this.from, this.to, this.seat, this.arrive, this.depart, this.adult, this.infant, this.child})
: super(key: key);
#override
_SearchState createState() => _SearchState(from: from, to: to, seat: seat, adult: adult, child: child, infant: infant, arrive: arrive, depart: depart);
}
class _SearchState extends State<Search> {
// Stream<QuerySnapshot> comparision;
var from, to, seat, adult, child, infant;
final DateTime arrive, depart;
_SearchState(
{Key key, this.from, this.to, this.seat, this.arrive, this.depart, this.adult, this.infant, this.child});
Stream<QuerySnapshot> comparision(BuildContext context) async* {
try{
yield* Firestore.instance
.collection('Schedules')
.where('from', isEqualTo: from.toString())
.where('to', isEqualTo: to.toString())
// .where('dates', arrayContains: widget.depart.day)
.snapshots();
}catch(e){
print(e);
}
}
// #override
// void initState() {
// // TODO: implement initState
// comparision = Firestore.instance
// .collection('Schedules')
// .where('from', isEqualTo: from)
// .where('to', isEqualTo: to)
// .snapshots();
//
// super.initState();
// }
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
Expanded(
child: StreamBuilder(
stream: Firestore.instance
.collection('Schedules')
.where('from', isEqualTo: from)
.where('to', isEqualTo: to)
.snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot){
if (!snapshot.hasData)
return Center(child: CircularProgressIndicator());
return ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index){
DocumentSnapshot power = snapshot.data.documents[index];
print(power['from']);
print(power['to']);
return Container(
height: 200,
width: MediaQuery.of(context).size.width,
child: Column(
children: [
Text(power['from']),
Text(power['to'])
],
),
);
}
);
}),
)
// Expanded(
// child: StreamBuilder<QuerySnapshot>(
// stream: comparision,
// builder: (BuildContext context, AsyncSnapshot<QuerySnapshot>snapshot) {
// if (!snapshot.hasData)
// return Center(child: CircularProgressIndicator());
// return ListView.builder(
// itemCount: snapshot.data.documents.length,
// itemBuilder: (context, index){
// DocumentSnapshot power = snapshot.data.documents[index];
// print(power['from']);
// print(power['to']);
// return Container(
// height: 200,
// width: MediaQuery.of(context).size.width,
// child: Column(
// children: [
// Text(power['from']),
// Text(power['to'])
// ],
// ),
// );
// }
// );
// },
// ),
// ),
],
)
);
}
}
class TripCard extends StatefulWidget {
#override
_TripCardState createState() => _TripCardState();
}
class _TripCardState extends State<TripCard> {
#override
Widget build(BuildContext context) {
return Container();
}
}
below is my first page code which includes the values
import 'package:flutter/material.dart';
import 'search.dart';
class Other extends StatefulWidget {
#override
_OtherState createState() => _OtherState();
}
class _OtherState extends State<Other> {
var from = [
'Addis Ababa', 'Adama', 'Dire Dawa', 'Ali Sabieh', 'Djibouti'
];
var fromSel = 'Addis Ababa';
var to = [
'Addis Ababa', 'Adama', 'Dire Dawa', 'Ali Sabieh', 'Djibouti'
];
var toSel = 'Djibouti';
#override
Widget build(BuildContext context) {
return Container(
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
child: Container(
//height: 203,
child: Column(
children: [
SizedBox(height: 15,),
Container(
//decoration: BoxDecoration(border: Border.all(color: Colors.grey)),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
width: MediaQuery.of(context).size.width/2-19,
height: 60,
padding: EdgeInsets.symmetric(horizontal: 15),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('From', style: TextStyle(
fontSize: 18,
color: Colors.grey
),),
SizedBox(height: 0,),
Expanded(
child: DropdownButton<String>(
underline: Container(color: Colors.transparent),
items: from.map((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value, style: TextStyle(
fontSize: 18
),),
);
}).toList(),
isExpanded: true,
isDense: false,
elevation: 5,
hint: Text('From'),
value: fromSel,
onChanged: (String newValue){
setState(() {
this.fromSel = newValue;
});
}),
),
],
),
),
Container(height: 50, child: VerticalDivider(color: Colors.grey)),
Container(
width: MediaQuery.of(context).size.width/2-19,
height: 60,
padding: EdgeInsets.symmetric(horizontal: 15),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('To', style: TextStyle(
fontSize: 18,
color: Colors.grey
),),
SizedBox(height: 0,),
Expanded(
child: DropdownButton<String>(
underline: Container(color: Colors.transparent),
items: to.map((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value, style: TextStyle(
fontSize: 18
),),
);
}).toList(),
isExpanded: true,
isDense: false,
elevation: 5,
hint: Text('to'),
value: toSel,
onChanged: (String newValue){
setState(() {
this.toSel = newValue;
});
}),
),
],
),
),
],
),
),
Padding(
padding: const EdgeInsets.symmetric(vertical: 20, horizontal: 10),
child: MaterialButton(
onPressed: () async{
await Navigator.of(context).push(MaterialPageRoute(builder: (context) => Search (
from: fromSel,
to: toSel,
depart: _startDate,
arrive: _endDate,
seat: _options[_selectedIndex],
adult: adultSel.toString(),
child: childSel.toString(),
infant: infantSel.toString(),
)));
},
minWidth: MediaQuery
.of(context)
.size
.width - 80,
height: 45,
shape:
RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
color: Colors.lightGreen,
splashColor: Colors.green,
child: Text(
"Search",
style: TextStyle(color: Colors.white, fontSize: 18),
),
),
)
],
),
),
),
);
}
}