Swift Firebase必须是非空字符串，不能包含“。” '＃''$''['或']' [英] Swift Firebase Must be a non-empty string and not contain '.' '#' '$' '[' or ']'

问题描述

这是我以前的问题的后续。我试图看看是否有一个电子邮件已被使用。

我正在使用该行

 如果snapshot.hasChild（email）{
  

电子邮件[e-mail]
当我输入那个时候，我到达。之前，应用程序崩溃，并给出了一个错误，说这个

 必须是非空字符串，不能包含'。'''''''''''''''''''
  

我看到很多关于检查用户名的帖子，但我的应用程序没有用户名，只是电子邮件。我能够使用电子邮件与

  hasChild（...）{... 
  （点）字符。如果你想在一个密钥中存储一个电子邮件地址，你必须对它进行编码。通常的做法是用，（逗号）替换。，这是不方便的电子邮件地址。所以 [e-mail] 会被编码为 test1 @ test，com 。
 
 
 
我不认为您实际上是将电子邮件地址存储为密钥，但是我会跟进您之前的问题。
 
This is a follow up to my previous question. I am trying to see if an email has already been used.

I am using the line 
if snapshot.hasChild(email) {
I have in my database an email [e-mail]
When I type that in..the moment I get to the '.' before com the app crashes and gives an error that says this 
Must be a non-empty string and not contain '.' '#' '$' '[' or ']'
I see a lot of posts about checking for usernames, but my app doesn't have usernames, just email. Am I able to use email with 
hasChild(...) {...

解决方案
Firebase keys cannot contain a . (dot) character. If you want to store an email address in a key, you'll have to encode it. The common way to do that is to replace the . with a , (comma), which conveniently is not allowed in email addresses. So [e-mail] would be encoded as test1@test,com.

I don't think you're actually storing the email address as a key, but I'll follow up for that on your previous question.

                        
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