仅在数据库中有数据时如何创建新用户-Laravel [英] how to create new user only if there is data in database-Laravel

问题描述

我已经完成了其他框架的编程工作，但这对我来说是新的，感谢您的进阶时间，我正在尝试创建新用户，条件是如果另一个表中有数据，那么将创建新用户，否则我已将我的代码放入if else语句中，并抛出错误.

I have done programming with other frameworks but this is new to me, thanks for your time in advanced, I'm trying to create new user on a condition that if there is data in another table then new user is created otherwise not I have put my code inside if else statement and is throwing errors.

下面列出了我用于创建新用户的功能:

my function for creating new user is listed below:

    protected function create(array $data)
    {
        /*$exists = \DB::table('received_pay')->where('email', $data['email'])->first();  */
          $exists=\DB::table('received_pay')->where('email', '=', $data['email'])->where('token', $data['token'])->exists();


if ($exists === null) {
   // user doesn't exist



        return User::create([
            'username' => $data['username'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
            'token'   => $data['token'],
        ]);

}else{
    return null;
}

}

}

这是它引发的错误

推荐答案

默认情况下，您需要从RegisterController@create方法返回User实例，但不能返回null.因此，请执行此操作，而不要使用return null;:

You need to return User instance from the RegisterController@create method by default, you can't return null. So, do this instead of return null;:

return User::where('email', $data['email'])->first();

如果可以选择检查用户是否在users表中，则可以使用firstOrCreate方法:

If it's an option to check if the user exists in the users table, you can use the firstOrCreate method:

protected function create(array $data)
{
    return User::firstOrCreate(['email' => $data['email'], [
        'username' => $data['username'],
        'password' => bcrypt($data['password']),
        'token' => $data['token'],
    ]);
}

此外，如果要检查received_pay表中是否存在用户，则可以保留原始的RegisterController@create方法并将此规则添加到RegisterController@validator方法中:

Also, you if want to check if a user exists in the received_pay table, you can leave original RegisterController@create method and add this rule to the RegisterController@validator method:

'email' => 'unique:received_pay,email',

如果received_pay表中已经存在具有相同电子邮件的用户，则这将不允许Laravel创建新用户.

This will not allow Laravel to create a new user if a user with the same email already exists in the received_pay table.

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