swift - Firestore 对 Order By 的查询无效？

Question

我正在尝试查询一组帖子。每个帖子都有一个观看者部分，如果观看者部分包含用户，则查询应返回该值。但是，当我运行查询时:

 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

            if (diff.type == .added) {

            }
            if (diff.type == .modified) {

            }
            if (diff.type == .removed) {

            }
        }

我收到错误 Invalid field path (watchedBy/BmVoasdfa34fdtiucWSb8XPPM42)。路径不得包含“~”、“*”、“/”、“[”或“]”。等效的 firebase 查询工作正常:

 let watchedByQuery = postReference.queryOrdered(byChild: "/watchedBy/" + UID!).queryStarting(atValue: "")

我尝试将代码更改为 let watchingQuery = postsReference.order(by: "watchedBy.\(UID!)").start(at: [""])。此查询有效，但 FireStore 没有返回任何内容。

编辑:

尝试过:

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

但仍然返回空。

Answer 1

结果我的发布方法仍然与进行乘法更新的 firebase 方法相同。因此，发布机制发布到错误的路径。