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[英]MYSQL How do I Select all emails from a table but limit number of emails with the same domain
[英]How do i limit the number of documents from Firebase with dates in Flutter
我正在構建一個 Flutter 應用程序,它通過 firebase cloud firestore 獲取文檔,但我希望它只顯示當天編寫的文檔。 就像我添加到集合中一樣,它只會返回今天的文檔。 請幫忙
Container(
height: MediaQuery.of(context).size.height,
child: StreamBuilder<QuerySnapshot>(
stream: Firestore.instance.collection('all').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Text('.....Loading');
}
return ListView.builder(
scrollDirection: Axis.vertical,
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot all = snapshot.data.documents[index];
return Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Column(
children: [
Text('10:00', style: TextStyle(fontSize: 18),),
SizedBox(height: 3,),
Text('05 Sep', style: TextStyle(fontSize: 13),),
],
),
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Europa league', style: TextStyle(fontSize: 15),),
SizedBox(height: 2,),
Text( '${all['gg']['home']} vs ${all['gg']['away']}', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w500),),
你只需要像這樣在查詢上放置一個 where 子句(這給出了過去 24 小時內所做的任何事情):
Firestore.instance
.collection("all")
.where("created_date", isGreaterThan: DateTime.now().subtract(Duration(days: 1)) )
.snapshots();
確保您的數據具有日期,插入時您可以這樣做:
Firestore.instance
.collection("all")
.add({
'data': "data",
'created_date' : FieldValue.serverTimestamp(),
});
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