Firebase删除值无法正常工作

Question

我想删除当前用户或当前uid的帖子。发布的用户的uid由String：uid在JSON中指定。所以我在快照中搜索uid，如果它存在，我删除该uid的父节点。问题是所有帖子都被删除而不是只存储当前uid的帖子。

JSON树

Posts
    -LBzjsl0Yfwdyh9xg6D2 (this is random uid)

           photoUrl: "https://firebasestorage.googleapis.com/v0/b/blo..."

           uid: "BBPHwd0RRibXFCvHcXA2aKbHoTm1" (this is uid of the current user)

代码：

let user = Auth.auth().currentUser?.uid

databaseRef.child("Posts").queryOrdered(byChild: "uid").queryEqual(toValue: user).observeSingleEvent(of: .value, with: { (snapshot) in


            if snapshot.exists() {


            //find out parent of current post
                let parent = snapshot.ref.parent!.key
                let ref = Database.database().reference()
                print (parent)
                func remove(child: String) {
                    ref.removeValue { error, _ in

                    }
                }
                remove(child: parent)