我这样做是为了连接两个colections对象和类别的结果。
我做了两个streambuilders来显示在一个列表中,在第一个列表中,我得到了类别并放入了一个地图,然后我查询了对象,并使用categoryID从地图中获得了类别对象:
StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection('categoryPath')
.snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> categorySnapshot) {
//get data from categories
if (!categorySnapshot.hasData) {
return const Text('Loading...');
}
//put all categories in a map
Map<String, Category> categories = Map();
categorySnapshot.data.documents.forEach((c) {
categories[c.documentID] =
Category.fromJson(c.documentID, c.data);
});
//then from objects
return StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection('objectsPath')
.where('day', isGreaterThanOrEqualTo: _initialDate)
.where('day', isLessThanOrEqualTo: _finalDate)
.snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> objectsSnapshot) {
if (!objectsSnapshot.hasData)
return const Text('Loading...');
final int count =
objectsSnapshot.data.documents.length;
return Expanded(
child: Container(
child: Card(
elevation: 3,
child: ListView.builder(
padding: EdgeInsets.only(top: 0),
itemCount: count,
itemBuilder: (_, int index) {
final DocumentSnapshot document =
objectsSnapshot.data.documents[index];
Object object = Object.fromJson(
document.documentID, document.data);
return Column(
children: <Widget>[
Card(
margin: EdgeInsets.only(
left: 0, right: 0, bottom: 1),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(
Radius.circular(0)),
),
elevation: 1,
child: ListTile(
onTap: () {},
title: Text(object.description,
style: TextStyle(fontSize: 20)),
//here is the magic, i get the category name using the map
of the categories and the category id from the object
subtitle: Text(
categories[object.categoryId] !=
null
? categories[
object.categoryId]
.name
: 'Uncategorized',
style: TextStyle(
color: Theme.of(context)
.primaryColor),
),
),
),
],
);
}),
),
),
);
我不确定你是想要什么,还是很清楚,但我希望它能帮助你。
