Question

我用来观察帖子的Firebase模型是这样的：

let postReference = Database.database().reference().child("posts")
    let watchedByQuery = postReference.queryOrdered(byChild: "/watchedBy/" + UID!).queryStarting(atValue: "")

但是，当我尝试将其转换为Firestore时，

let postsReference = Firestore.firestore().collection("posts")
        let watchingQuery = postsReference.order(by: "/watchedBy/" + UID!).start(at: [""])
    watchingQuery.addSnapshotListener { (querySnapshot, error) in
        guard let snapshot = querySnapshot else {
            print("Error fetching snapshots: \(error!)")
            return
        }
        snapshot.documentChanges.forEach { diff in

我收到错误Invalid field path (/watchedBy/P02bS6QrVE122yjrU7L87X2). Paths must not contain '~', '*', '/', '[', or ']''

似乎是什么问题？本质上，该查询检查在watchedBy部分中具有用户ID的帖子。但是，FireStore转换似乎无效。

Answer 1

本质上，我只是添加了一个whereField，以便存在watchedBy / UID。

let postsReference = Firestore.firestore().collection("posts") 
let watchingQuery = postsReference.whereField("watchedBy."+(UID!), isGreaterThan:"")

编辑：

请注意更改自

"/watchedBy/" + UID!

设置为格式正确的Firestore子引用

"watchedBy."+(UID!)

Firestore订购查询无法像Firebase一样工作？

1 个答案: