FirebaseDatabase runTransaction阻止问题

Question

我正在努力更新FirebaseDatabase中的多个runTransactionBlock节点。此块应增加likesCount和recordsCount。最初，当发布一个帖子时，那些被设置为0.所以，我检查likesCount == 0是否是，这意味着这是第一个喜欢帖子所以它只需在单独的节点中使用userUid设置likes数组，并设置值true。然后递增此节点中的likesCount和recordsCount以及runTransactionBlock以更新其值。第一次，这是有效的。它设定了它们的价值。

func incrementLikes(postId: String, onSuccess: @escaping (Post) -> Void, onError: @escaping (_ errorMessage: String?) -> Void) {

    let postRef = Api.Post.REF_POSTS.child(postId)

    postRef.runTransactionBlock({ (currentData) -> TransactionResult in
        if var post = currentData.value as? [String : AnyObject] {

            var likesCount = post["likesCount"] as? Int ?? 0
            var recordsCount = post["recordsCount"] as?  Int ?? 0

            if likesCount == 0 { // First like for the post

               // add self in posts_likes > postId > likes
               // increment likes count & increment records Count
                Api.Posts_Likes.firstPostsLikes(postId: postId)
                likesCount += 1
                recordsCount += 1
            }
            else {
                Api.Posts_Likes.setPostsLikes(postId: postId, onSuccess: { (isPostLiked) in  // checks if user liked the post or not, if he did, his id was added in posts_likes > likes

                    if isPostLiked {
                        likesCount += 1
                        recordsCount += 1
                    }
                    else {
                        likesCount -= 1
                        recordsCount -= 1
                    }

                }, onError: { (errMessage) in
                    onError(errMessage)
                })
            }

            post["recordsCount"] = recordsCount as AnyObject?
            post["likesCount"] = likesCount as AnyObject?

            currentData.value = post

            return TransactionResult.success(withValue: currentData)
        }
        return TransactionResult.success(withValue: currentData)
    })
    { (error, committed, snapshot) in
        if let error = error {
            onError(error.localizedDescription)
        }
        if let dict = snapshot?.value as? [String: Any] {
            let post = Post.transformDataToImagePost(dictionary: dict, key: snapshot!.key)
            onSuccess(post)
        }
    }
}

当用户再次点击该按钮时，它会进入else语句，因为likesCount不再等于0。这是它无法正常工作的地方。调用Api.Posts_Likes.setPostsLikes(postId: postId, onSuccess:)时，无论用户是否喜欢该帖子，都应返回Bool值。根据{{​​1}}值，它应bool或increment decrement＆amp; likesCount节点中的recordsCount。但它并没有，我不明白为什么。

posts

这就是 func firstPostsLikes(postId: String) { guard let currentUser = Api.Users.CURRENT_USER else { return } REF_POSTS_LIKES.child(postId).child("likes").child(currentUser.uid).setValue(true) } func setPostsLikes(postId: String, onSuccess: @escaping (Bool) -> Void, onError: @escaping (_ errorMessage: String?) -> Void) { let postLikesRef = Api.Posts_Likes.REF_POSTS_LIKES.child(postId) guard let currentUser = Api.Users.CURRENT_USER else { return } var userLikedPost: Bool = false postLikesRef.runTransactionBlock ({ (currentPostsLikesData) -> TransactionResult in if var postLikes = currentPostsLikesData.value as? [String : AnyObject] { var likes = postLikes["likes"] as? [String : Bool] ?? [:] if let _ = likes[currentUser.uid] { // Unlike the post and remove self from likes likes.removeValue(forKey: currentUser.uid) userLikedPost = false } else { // Like the post, add self to posts_likes, increase likesCount & recordsCount likes[currentUser.uid] = true userLikedPost = true } postLikes["likes"] = likes as AnyObject currentPostsLikesData.value = postLikes return TransactionResult.success(withValue: currentPostsLikesData) } return TransactionResult.success(withValue: currentPostsLikesData) }) { (error, committed, snapshot) in if let error = error { onError(error.localizedDescription) } onSuccess(userLikedPost) } 的样子：

FirebaseDatabase节点中的recordsCount是posts，commentsCount，likesCount和repostsCount的总和。在单元格中加载新applaudsCount时，我唯一需要显示的是post。这就是为什么我不想在帖子本身下放置所有喜欢，赞扬，评论等等的原因，因为除非用户点击recordsCount，否则它将无需下载大量数据按钮实际