如何检查我的 Cloud Firestore 集合是否包含任何文档
[英]how to check if my cloud firestore collection contains contains any documents
问题描述
I am trying to check if my firestore collection "payments" contains any documents where the string userActive is contained in any document field array called participants,and if it doesn't perform an action or if it does perform a different action, this is what i have tried so far but its not working
我正在尝试检查我的 firestore 集合“付款”是否包含任何文档，其中字符串 userActive 包含在任何称为参与者的文档字段数组中，并且如果它不执行操作或执行不同的操作，这就是到目前为止我已经尝试过但它不起作用
import 'package:flutter/material.dart';
import 'package:wallet_app/send.dart';
import 'package:wallet_app/send_money.dart';
import 'package:wallet_app/recieve.dart';
import 'package:wallet_app/load.dart';
import 'package:wallet_app/account.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:wallet_app/CardScreen.dart';
import 'package:flutter_icons/flutter_icons.dart';
class HomeScreener extends StatefulWidget{
HomeScreen createState()=> HomeScreen();
}
class HomeScreen extends State<HomeScreener> {
HomeScreen createState() => HomeScreen();
final databaseReference = FirebaseFirestore.instance;
var userId = "dAIdrQggsrxvQ4KUo2aJ";
var userActive = "kim";
var userHasData = 0;
checkDatabase()async {
final docSnapshot = await FirebaseFirestore.instance
.collection('payments')
.where('participants', arrayContains: userActive)
.getDocuments();
if(docSnapshot.documents.isEmpty) {
// Your queried documents do not exist
userHasData = 1;
}
else if(docSnapshot.documents.isEmpty){
// Your queried documents do not exist
}
userHasData = 2;
}
@override
Widget build(BuildContext context) {
return Container(
height: MediaQuery.of(context).size.height,
width: double.infinity,
child: Stack(
children: <Widget>[
//Container for top data
Container(
margin: EdgeInsets.symmetric(horizontal: 32, vertical: 32),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text("Hello " + "$userActive", style: TextStyle(color: Colors.white, fontSize: 28, fontWeight: FontWeight.w700),),
Container(
margin: EdgeInsets.only(top: 20),
child: Row(
children: <Widget>[
// Icon(Icons.notifications, color: Colors.lightBlue[100],),
SizedBox(width: 16,),
CircleAvatar(
radius: 25,
backgroundColor: Colors.white,
child: ClipOval(
child: Image.asset("assets/newdp.png", fit: BoxFit.contain,),
),
)
],
),
)
],
),
Text("What would you like to do today?", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 16, color: Colors.blue[100]),),
SizedBox(height : 40,),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
child: Column(
children: <Widget>[
Container(
decoration: BoxDecoration(
color: Color.fromRGBO(243, 245, 248, 1),
borderRadius: BorderRadius.all(Radius.circular(18))
),
child:IconButton(
icon: Icon(Icons.send, color: Colors.blue[900], size: 30,),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => sendPager()),
);
},
),
padding: EdgeInsets.all(3),
),
SizedBox(
height: 10,
),
Text("Send", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 14, color: Colors.blue[100]),),
],
),
),
Container(
child: Column(
children: <Widget>[
Container(
decoration: BoxDecoration(
color: Color.fromRGBO(243, 245, 248, 1),
borderRadius: BorderRadius.all(Radius.circular(18))
),
child:IconButton(
icon: Icon(Icons.account_balance, color: Colors.blue[900], size: 30,),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => loadPager()),
);
},
),
padding: EdgeInsets.all(3),
),
SizedBox(
height: 10,
),
Text("Account", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 14, color: Colors.blue[100]),),
],
),
),
Container(
child: Column(
children: <Widget>[
Container(
decoration: BoxDecoration(
color: Color.fromRGBO(243, 245, 248, 1),
borderRadius: BorderRadius.all(Radius.circular(18))
),
child:IconButton(
icon: Icon(Icons.people, color: Colors.blue[900], size: 30,),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => loadPager()),
);
},
),
padding: EdgeInsets.all(3),
),
SizedBox(
height: 10,
),
Text("Recipients", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 14, color: Colors.blue[100]),),
],
),
),
Container(
child: Column(
children: <Widget>[
Container(
decoration: BoxDecoration(
color: Color.fromRGBO(243, 245, 248, 1),
borderRadius: BorderRadius.all(Radius.circular(18))
),
child:IconButton(
icon: Icon(Icons.add, color: Colors.blue[900], size: 30,),
onPressed: () {
databaseReference.collection("payments").add(
{
"amount_paid" : "2444242",
"amount_received" : "33535",
"currency_received" : "¥",
"currency_sent" :"K",
'date':FieldValue.serverTimestamp(),
"participants" :["kim", "john" ],
"receiver_name" : "john",
"sender_name" : "kim"
}).then((value){
print("================================sucess=============================================================");
print(value.documentID);
});
Navigator.push(
context,
MaterialPageRoute(builder: (context) => loadPager()),
);
},
),
padding: EdgeInsets.all(3),
),
SizedBox(
height: 10,
),
Text("Invite", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 14, color: Colors.blue[100]),),
],
),
)
],
)
],
),
),
//draggable sheet
DraggableScrollableSheet(
builder: (context, scrollController){
return Container(
decoration: BoxDecoration(
color: Color.fromRGBO(243, 245, 248, 1),
borderRadius: BorderRadius.only(topLeft: Radius.circular(40), topRight: Radius.circular(40))
),
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
SizedBox(height: 24,),
Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text("Recent Transactions", style: TextStyle(fontWeight: FontWeight.w900, fontSize: 24, color: Colors.black),),
Text("See all", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 16, color: Colors.grey[800]),)
],
),
padding: EdgeInsets.symmetric(horizontal: 32),
),
SizedBox(height: 24,),
//Container for buttons
Container(
padding: EdgeInsets.symmetric(horizontal: 32),
child: Row(
children: <Widget>[
Container(
child: Text("All", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 14, color: Colors.grey[900]),),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(20)),
boxShadow: [BoxShadow(color: Colors.grey[200], blurRadius: 10.0, spreadRadius: 4.5)]
),
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 10),
),
SizedBox(width: 16,),
Container(
child: Row(
children: <Widget>[
CircleAvatar(
radius: 8,
backgroundColor: Colors.green,
),
SizedBox(
width: 8,
),
Text("Recieved", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 14, color: Colors.grey[900]),),
],
),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(20)),
boxShadow: [BoxShadow(color: Colors.grey[200], blurRadius: 10.0, spreadRadius: 4.5)]
),
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 10),
),
SizedBox(width: 16,),
Container(
child: Row(
children: <Widget>[
CircleAvatar(
radius: 8,
backgroundColor: Colors.orange,
),
SizedBox(
width: 8,
),
Text("Transfer", style: TextStyle(fontWeight: FontWeight.w700, fontSize: 14, color: Colors.grey[900]),),
],
),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(20)),
boxShadow: [BoxShadow(color: Colors.grey[200], blurRadius: 10.0, spreadRadius: 4.5)]
),
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 10),
)
],
),
),
SizedBox(height: 16,),
//Container Listview for expenses and incomes
Container(
child: Text(" ", style: TextStyle(fontSize: 15, fontWeight: FontWeight.w700, color: Colors.grey[500]),),
padding: EdgeInsets.symmetric(horizontal: 32),
),
SizedBox(height: 5),
StreamBuilder(
stream: FirebaseFirestore.instance.collection("payments").where('participants', arrayContains: userActive).snapshots(),
builder: (context, snapshot){
checkDatabase();
return Container ( child:ListView.builder(
shrinkWrap: true,
itemCount: snapshot.data.documents.length,
padding: EdgeInsets.all(0),
controller: ScrollController(keepScrollOffset: false),
itemBuilder: (context, index){
DocumentSnapshot documentSnapshot = snapshot.data.docs[index];
//if(snapshot.connectionState == ConnectionState.active && snapshot.hasData) {
if(userHasData == 1){
print(" no Data!!!");
return Center(child: Text("No Data"));
}
else if (userHasData == 2){
print("Found Data!!!");
if(documentSnapshot.data()["receiver_name"] == userActive ) {
return Container(
margin: EdgeInsets.symmetric(horizontal: 32,vertical: 5),
padding: EdgeInsets.all(16),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(20))
),
child: Row(
children: <Widget>[
Container(
decoration: BoxDecoration(
color: Colors.grey[100],
borderRadius: BorderRadius.all(Radius.circular(18))
),
child: Icon(Icons.attach_money, color: Colors.lightBlue[900],),
padding: EdgeInsets.all(12),
),
SizedBox(width: 16,),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text("Recieved", style: TextStyle(fontSize: 18, fontWeight: FontWeight.w700, color: Colors.grey[900]),) ,
Text("" + documentSnapshot.data()["currency_received"] + documentSnapshot.data()["amount_received"], style: TextStyle(fontSize: 15, fontWeight: FontWeight.w700, color: Colors.grey[500]),),
],
),
),
Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
Text("+ " + documentSnapshot.data()["currency_sent"] + documentSnapshot.data()["amount_paid"].toString(), style: TextStyle(fontSize: 18, fontWeight: FontWeight.w700, color: Colors.lightGreen),),
Text(documentSnapshot.data()["date"].toDate().toString(), style: TextStyle(fontSize: 15, fontWeight: FontWeight.w700, color: Colors.grey[500]),),
],
),
],
),
);
}else if (documentSnapshot.data()["sender_name"] == userActive){
return Container(
margin: EdgeInsets.symmetric(horizontal: 32,vertical: 5),
padding: EdgeInsets.all(16),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(20))
),
child: Row(
children: <Widget>[
Container(
decoration: BoxDecoration(
color: Colors.grey[100],
borderRadius: BorderRadius.all(Radius.circular(18))
),
child: Icon(Icons.attach_money, color: Colors.lightBlue[900],),
padding: EdgeInsets.all(12),
),
SizedBox(width: 16,),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text("Sent", style: TextStyle(fontSize: 18, fontWeight: FontWeight.w700, color: Colors.grey[900]),) ,
Text("" + documentSnapshot.data()["currency_received"] + documentSnapshot.data()["amount_received"], style: TextStyle(fontSize: 15, fontWeight: FontWeight.w700, color: Colors.grey[500]),),
],
),
),
Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
Text("- " + documentSnapshot.data()["currency_sent"] + documentSnapshot.data()["amount_paid"].toString(), style: TextStyle(fontSize: 18, fontWeight: FontWeight.w700, color: Colors.orange),),
Text(documentSnapshot.data()["date"].toDate().toString(), style: TextStyle(fontSize: 15, fontWeight: FontWeight.w700, color: Colors.grey[500]),),
],
),
],
),
);
}
}
// } return Center(child: const CircularProgressIndicator());
}
)
);
}
),
],
),
controller: scrollController,
),
);
},
initialChildSize: 0.65,
minChildSize: 0.65,
maxChildSize: 1,
)
],
),
);
}
}
1 个解决方案
解决方案1
0 2020-09-13 12:46:38
Try using .exists :尝试使用.exists ：
final docSnapshot = await Firestore.instance.collection('payments').document("document_id").get();
if (docSnapshot.exists){
//document exists
}
else{
//document does not exists
}
for all documents:对于所有文件：
final doc = await Firestore.instance.collection('payments').getDocuments();
if (doc.documents.isEmpty){
//Collection is empty
}
else{
//collection has documents
}
You can apply the logic before using it in the element, like on start of the class then use futureBuilder .您可以在元素中使用逻辑之前应用逻辑，例如在类开始时然后使用futureBuilder 。 You can set a bool using the above logic and then using the visibility widget to show the futureBuilder only if the document is available.您可以使用上述逻辑设置bool ，然后仅在文档可用时使用visibility小部件显示futureBuilder 。
For your case:对于您的情况：
final docSnapshot = await Firestore.instance
.collection('bus_information_user')
.where('participants', arrayContains: userActive)
.getDocuments();
if(docSnapshot.documents.isEmpty){
// Your queried dosuments does not exist
}
else{
// Your queried dosuments does exist
}
Ps:.附：。 I have not tried out the last part but should do the job.我还没有尝试过最后一部分，但应该可以完成这项工作。
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