我很难同时检索 postId 和 commentId。
目标是允许用户删除自己对帖子的评论。
这是评论结构，下面是一个应该删除用户评论的函数，但是由于某种原因我只能返回commentId而不是postId。所以点击时评论不会被删除。
如果我在最后的类似中运行断点，则 postId 将 = nil deleteComment，但如果我func fetchComment在 postId的最后一行运行断点，则将返回 postId 用于帖子的任何内容。
struct Comment {
var commentId: String!
let user: User
var creationDate: Date!
let text: String
let uid: String!
init(commentId: String!,user: User, dictionary: [String: Any]) {
self.commentId = commentId
self.user = user
self.text = dictionary["text"] as? String ?? ""
self.uid = dictionary["uid"] as? String ?? ""
if let creationDate = dictionary["creationDate"] as? Double {
self.creationDate = Date(timeIntervalSince1970: creationDate)
}
}
var post: Post?
func deleteComment() {
guard let postId = self.post?.postId else { return }
guard let commentId = self.commentId else { return }
let commentsRef = Database.database().reference().child("comments")
commentsRef.child(postId).child(commentId).removeValue()
}
以下是获取评论的方式
var comments = [Comment]()
func fetchComments() {
guard let postId = self.post?.postId else { return }
let ref = Database.database().reference().child("comments").child(postId)
ref.observe(.childAdded, with: { (snapshot) in
let commentId = snapshot.key
//print(commentId)
guard let dictionary = snapshot.value as? [String: Any] else { return }
guard let uid = dictionary["uid"] as? String else { return }
Database.fetchUserWithUID(with: uid, completion: { (user) in
let comment = Comment(commentId: commentId, user: user, dictionary: dictionary)
self.comments.append(comment)
self.collectionView?.reloadData()
})
}) { (err) in
print("Failed to observe comments")
}
}
另外，这是用户提交评论时的代码
func didSubmit(for comment: String) {
guard let uid = Auth.auth().currentUser?.uid else { return }
print("post id:", self.post?.postId ?? "")
print("Inserting comment:", comment)
let postId = self.post?.postId ?? ""
let values = ["text": comment, "creationDate": Date().timeIntervalSince1970, "uid": uid] as [String : Any]
Database.database().reference().child("comments").child(postId).childByAutoId().updateChildValues(values) { (err, ref) in
if let err = err {
print("Failed to insert comment:", err)
return
}
self.uploadCommentNotificationToServer()
if comment.contains("@") {
self.uploadMentionNotification(forPostId: postId, withText: comment, isForComment: true)
}
self.containerView.clearCommentTextView()
}
}
Json 通过 firebase 发表评论
"comments" : {
"-Lord0UWPkh5YdGIHtAO" : {
"-Lp7AQzHccme5RcRsyDd" : {
"creationDate" : 1.568874020882821E9,
"text" : "Wow Cool!",
"uid" : "wELwYnMGxxW0LJNRKBuuE2BUaV93"
}
},
"-LowvCk-agvJbK0VF-Bq" : {
"-LpKm1NcgOsXhwj6soxE" : {
"creationDate" : 1.569102243436777E9,
"text" : "Nice!",
"uid" : "wELwYnMGxxW0LJNRKBuuE2BUaV93"
},
一种选择是将 postId 设为 Comment 结构中的一个属性并将其添加到 init 方法中，这样您将始终可以访问它
struct Comment {
let postId: String
var commentId: String!
let user: User
var creationDate: Date!
let text: String
let uid: String!
init(commentId: String!,user: User, postIdentifier: String, dictionary: [String: Any]) {
self.commentId = commentId
self.user = user
self.postId = postIdentifier
...
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我来说两句