如何在颤动中从 Firestore 中检索每个文档的文档 ID

Question

这里我有从 Firebase 检索所有文档的代码，我只能检索文档中存在的数据，但我也想用它检索文档 ID，我该怎么做？

StreamBuilder<QuerySnapshot>(
          stream: getData(),
          builder: (BuildContext context,
              AsyncSnapshot<QuerySnapshot> snapshot) {
            if (snapshot.hasError)
              return new Text('Error: ${snapshot.error}');
            switch (snapshot.connectionState) {
              case ConnectionState.waiting:
                return new Text('Loading...');
              default:
                return new ListView(
                  children: snapshot.data.documents
                      .map((DocumentSnapshot document) {
                    return new CustomCard(
                      name: document['name'],
                      phone: document['phno'],
                      service: document['Category'],
                      address: document['address'],
                      pin: document['pin'],
                      payment: document['Payment'],
                    );
                  }).toList(),
                );
            }
          },
        ),

这是我的getter函数

     Stream<QuerySnapshot> getData()async*{
    FirebaseUser user = await FirebaseAuth.instance.currentUser();
    yield* Firestore.instance
        .collection('User')
        .where("userId", isEqualTo: user.uid)
        .orderBy('upload time', descending: true)
        .snapshots();
  }

Answer 1

要获取 id，请执行以下操作：

 .map((DocumentSnapshot document) {
                    return new CustomCard(
                      docId : document.documentID,
                      name: document['name'],
                      phone: document['phno'],
                      service: document['Category'],
                      address: document['address'],
                      pin: document['pin'],
                      payment: document['Payment'],
                    );
                  }).toList(),

documentID 会给你每个文档的 ID。

Answer 2

你也可以这样做

snapshot.data!.docs[index].id

这将返回该索引处文档的 id