Ios Swift-Firebase是否可以同时进行扇出和运行事务

当同时更新多个引用和运行TransactionBlock时，是否有方法执行原子更新/扇出？下面的代码工作正常，但如果在更新

updatefollowerscont

func或

updateFollowingCount

func时出现问题，则计数属性将不正确

将事务添加到

扇形输出中

将保证一次成功或失败。不过我想不出一个办法

func runFanout() {

    // currentUser is following otherUser, use fanout to update both refs
    let followersRef = "followers/\(otherUserId)/\(currentUserId)"
    let followingRef = "following/\(currentUserId)/\(otherUserId)"
        
    var dict = [String: Any]()
    dict.updateValue(1, forKey: followersRef)
    dict.updateValue(1, forKey: followingRef)
        
    let rootDbRef = Database.database().reference()
    rootDbRef.updateChildValues(dict, withCompletionBlock: { (error, ref) in

        if let error = error { return }

        self.updateFollowersCount(for: otherUserId)

        self.updateFollowingCount(for: currentUserId)
    })
}

func updateFollowersCount(for userId: String) {
    
    let followersCount = Database.database().reference().child("users").child(userId)
    followersCount.runTransactionBlock({ (currentData: MutableData) -> TransactionResult in
        
        if var dict = currentData.value as? [String: Any] {
            
            var count = dict["followers_count"] as? Int ?? 0

            count += 1
            
            dict["followers_count"] = count
            
            currentData.value = dict
        }
        
        return TransactionResult.success(withValue: currentData)
        
    }, andCompletionBlock: { [weak self](error, completion, snap) in

        if !completion || (error != nil) {
            print("The value wasn't able to update")
        } else {
            print("The value updated")
        }
    })
}

func updateFollowingCount(for userId: String) {
    
    let followingCount = Database.database().reference().child("users").child(userId)
    followingCount.runTransactionBlock({ (currentData: MutableData) -> TransactionResult in
        
        if var dict = currentData.value as? [String: Any] {
            
            var count = dict["following_count"] as? Int ?? 0

            count += 1
            
            dict["following_count"] = count
            
            currentData.value = dict
        }
        
        return TransactionResult.success(withValue: currentData)
        
    }, andCompletionBlock: { [weak self](error, completion, snap) in

        if !completion || (error != nil) {
            print("The value wasn't able to update")
        } else {
            print("The value updated")
        }
    })
}