我想访问当前登录用户的所有 reg_events。我现在有以下代码
stream: Firestore.instance.collection('users').document(email).snapshots(),
builder: (context, snapshot){
if(!snapshot.hasData){
return Text("Loading..");
}
return Center(
child: new Container(
child: new PageView.builder(
onPageChanged: (value) {
setState(() {
currentpage = value;
});
},
controller: controller,
itemCount: snapshot.data['reg_events'].length,
itemBuilder: (context, index) => builder(index, snapshot.data)),
),
);
}
),
“ build 者”是:
builder(int index, DocumentSnapshot document) {
return new AnimatedBuilder(
animation: controller,
builder: (context, child) {
double value = 1.0;
if (controller.position.haveDimensions) {
value = controller.page - index;
value = (1 - (value.abs() * .5)).clamp(0.0, 1.0);
}
return new Center(
child: new SizedBox(
height: Curves.easeOut.transform(value) * 200,
width: Curves.easeOut.transform(value) * 1000,
child: child,
),
);
},
child: new Card(
child: Text(document.data['reg_events'][0].toString(),
textAlign: TextAlign.center,
style: TextStyle(fontSize: 15, color: Colors.white),),
margin: const EdgeInsets.all(10.0),
color: index % 2 == 0 ? Colors.blue : Colors.red,
),
);
}
但它输出“'DocumentReference'的实例”。如何访问此文档引用？
最佳答案
也许它不能将 reg_event 理解为列表，所以试试这个，
stream: Firestore.instance.collection('users').document(email).snapshots(),
builder: (context, snapshot){
List regEvent = new List();
if(snapshot.hasData){
regEvent = snapshot.data['reg_events'];
}
if(!snapshot.hasData){
return Text("Loading..");
}
return Center(
child: new Container(
child: new PageView.builder(
onPageChanged: (value) {
setState(() {
currentpage = value;
});
},
controller: controller,
itemCount: regEvent.length,
itemBuilder: (context, index) {
print(regEvent[index]);
return builder(index, snapshot.data)),}
),
);
}
),
关于android - 如何在 flutter 中访问 DocumentReference 数组？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59281987/