请帮助我是 firebase 的新手，我想得到 field Widgetid name'name in 集合名称'用户'
(FirebaseFirestore.instance.collection('Users').doc(uid).collection('Widget').snapshots() )
用于从另一个集合中获取数据Name 'Widget'
( FirebaseFirestore.instance.collection('Widget').doc(type).snapshots() )
要获取真实数据，抱歉我不知道如何 解释更多，请阅读代码让你明白
主页()
String type,
final _widget = FirebaseFirestore.instance
.collection('Users')
.doc(uid)
.collection('Widget')
.snapshots();
final color = Theme.of(context).primaryColor;
final color1 = Theme.of(context).accentColor;
final shadow = Theme.of(context).cardColor;
return Container(
child: Column(
children: [
Text(
'Widget Menu',
style: Theme.of(context).textTheme.headline5,
),
StreamBuilder<QuerySnapshot>(
stream: _widget,
builder: (context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return Center(
child: CircularProgressIndicator(),
);
}
return Container(
height: 50*SizeConfig.heightMultiplier,
child: ListView(
children: snapshot.data.docs.map((document) {
return Card(
color: color1,
shadowColor: shadow,
elevation: 8,
child: Container(
height: 15*SizeConfig.heightMultiplier,
child: Row(
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Card(
color: color1,
elevation: 5,
child: CircleAvatar(
backgroundImage: document['image'] != null ?
(themeProvider.isDarkMode
? AssetImage('images/MainDark.png')
: AssetImage('images/MainLight.png'))
: NetworkImage(document['image']),
backgroundColor: color1,
minRadius: 50,
),
),
),
Text(document['name']),
IconButton(icon: Icon(Icons.arrow_forward_ios_outlined),
onPressed: (){
setState(() {
type = document['name'];
print(type);
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
WidgetHome()));
});
})
],
),
),
);
}).toList(),
),
);
})
],
),
);
}
}
小部件主页()
Container(
width: double.maxFinite,
height: double.maxFinite,
decoration: BoxDecoration(
borderRadius: BorderRadius.all(
Radius.circular(
2 * SizeConfig.heightMultiplier)),
color: color1,
),
child: SafeArea(
child: Container(
child: Container(
child: Column(
children: [
TextButton(
child: Text(type),
onPressed: (){
print(type);
},
),
StreamBuilder(
stream:FirebaseFirestore.instance.collection('Widget').doc(type).snapshots(),
builder: (context, snapshot1) {
if(!snapshot1.hasData){return Align(alignment:
Alignment.center,child: Center(
child: SpinKitThreeBounce(
duration: Duration(milliseconds: 5000),
color: color,
size: 50.0,
),
),
);
}
var id = snapshot1.data;
return Container(
child: Column(
children: [
Text(id['name'],style: Theme.of(context).textTheme.headline5,),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Card(
shadowColor: shadow,
elevation: 5,
child: Container(
color: color1,
height: 30*SizeConfig.heightMultiplier,
width: 20*SizeConfig.heightMultiplier ,
child: Image(
image: NetworkImage(id['image']),),
),
),
],
),
Container(
height: 45*SizeConfig.heightMultiplier,
color: Colors.yellow,
child: id['Type']== 'test1'
? Test1() : (id['Type']=='test2' ? Test2() : Align(alignment: Alignment.center,child: Center(
child: SpinKitThreeBounce(
duration: Duration(milliseconds: 5000),
color: color,
size: 50.0,
),
),
) ),
)
],
)
);
}
),
Align(
alignment: Alignment.bottomLeft,
child: GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
HomePage()));
},
child: Align(
alignment: Alignment.bottomLeft,
child: Row(
children: [
SizedBox(
width: 7,
),
Icon(
Icons
.arrow_back_ios_outlined,
size: 3.5 *
SizeConfig
.heightMultiplier,
color: color,
),
Text(
"HomePage",
style: Theme.of(context)
.textTheme
.headline5,
)
],
),
),
),
),
],
),
),
),
),
),
答案 0 :(得分：0)
您需要更新获取字段的方式：
document['image']
到：
document.get('image')
或
document.data()['image']
来自DocumentSnapshotPlatform documentation
<块引用>DocumentSnapshotPlatform 类
包含从 Firestore 数据库中的文档读取的数据。 可以通过调用data()或者调用get()来获取数据 特定领域。
编辑：
您似乎正在尝试使用下一行中不存在的文档 ID：
stream:FirebaseFirestore.instance.collection('Widget').doc(type).snapshots()
type 应该替换为文档 id 而不是文档中对象的 name 属性，这是 type 在下面的代码片段中代表的内容（来自您的评论） :
type = document['name'];