Flutter Firebase循环处理文档中的集合 [英] Flutter Firebase Loop over collection in a document

问题描述

我的数据库中有以下路径:

I have this path in my Database:

/messages/tT2Q16n1FMZoTNZQOejtWuJdCmD2/ZqihbgR7skcytLAe88fQecmxcIc2-tT2Q16n1FMZoTNZQOejtWuJdCmD2/1579626761580

从这里我必须获得 content .

我正在尝试:

var snapshot = Firestore.instance.collection('messages').document(user.id).snapshots();

但是如何遍历这些项目并从每个馆藏中获取内容?

but how can I loop over these items and get content from each collection?

然后在我的UI中，我要打印此内容消息:

And then in my UI I want to print this content message:

              Container(
                child: Text(
                  'Content: ${document['content']}',
                  style: TextStyle(color: primaryColor),
                ),
                alignment: Alignment.centerLeft,
                margin: EdgeInsets.fromLTRB(10.0, 0.0, 0.0, 5.0),
              ),

推荐答案

Firestore的客户端SDK无法请求集合列表.因此，您将需要以一种可以已经嵌入到代码中的方式来命名集合，或者使用一个Admin SDK来获取集合名称列表，并以某种方式将其公开给客户端代码(例如通过Cloud Functions).

The client-side SDKs for Firestore have no way to request a list of collections. For this reason you'll either need to name your collections in a way that you can embed in your code already, or use one of the Admin SDKs to get a list of collection names and expose that to your client-side code in some way (for example through Cloud Functions).

另请参阅:

• 获取Firestore中的所有集合
• >尝试列出Firestore数据库的集合
• 如何在Cloud Firestore文档中列出子集合
• 查看全文