Rails：当记录不存在时记录存在回滚

Question

我是 rails 的新手。我正在尝试创建一个用户并在检查唯一性时获得回滚。我专门在开发数据库中工作。我可以在我的索引页上看到查询的用户，所以数据库确实匹配。

Started POST "/users" for 127.0.0.1 at 2015-01-01 17:02:17 -0600
Processing by UsersController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"<TOKEN THAT MATCHES THE FORM>", "user"=>{"first_name"=>"First", "last_name"=>"Test", "username"=>"test1", "email"=>"test1@self.com", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]"}, "commit"=>"Create User"}
   (0.2ms)  BEGIN
  User Exists (0.4ms)  SELECT  1 AS one FROM `users` WHERE `users`.`username` = BINARY 'test1' LIMIT 1
  User Exists (0.2ms)  SELECT  1 AS one FROM `users` WHERE `users`.`email` = BINARY 'test1@self.com' LIMIT 1
   (0.1ms)  ROLLBACK
  Rendered users/_form.html.erb (1.9ms)
  Rendered users/new.html.erb within layouts/application (3.8ms)
Completed 200 OK in 178ms (Views: 56.3ms | ActiveRecord: 0.9ms)

所以我检查了我的 table 看它是否确实存在。

mysql> SELECT * FROM users;
+----+------------+---------------+------------------+------------+--------------------+---------------------+---------------------+
| id | first_name | last_name     | email            | username   | password_digest    | created_at          | updated_at          |
+----+------------+---------------+------------------+------------+--------------------+---------------------+---------------------+
|  1 | Initial    | User          | test0@self.com   | test0      | <SOME LONG DIGEST> | 2015-01-01 03:56:39 | 2015-01-01 03:56:39 |
+----+------------+---------------+------------------+------------+--------------------+---------------------+---------------------+
1 row in set (0.00 sec)

如果我像 Rails 那样运行命令：

mysql> SELECT  1 AS one FROM `users` WHERE `users`.`username` = BINARY 'test1' LIMIT 1;
Empty set (0.00 sec)

mysql> SELECT  1 AS one FROM `users` WHERE `users`.`email` = BINARY 'test1@self.com' LIMIT 1;
Empty set (0.00 sec)

没有。为什么会发生这种情况，是否有一种好方法可以查看实际发生的情况？

Answer 1

我猜这很可能是以下任一方面的问题：

A) 模型中的验证（全部删除并再次测试）- 如果有效，一次添加一次，然后找出导致回滚的验证。

例子models/user.rb

validates :username, presence: true, uniqueness: { case_sensitive: false }

B) 您错过了将要保存的属性之一添加到参数列表的机会

示例 controllers/users_controller.rb:

def user_params
  params.require(:user).permit(:first_name, :last_name, :email, :username, :password_digest, :_destroy)
end

试试 (A) - 我遇到过很多次。

Answer 2

您可以尝试评论您的验证（在您的模型代码中）并使用您的种子而不会出现验证问题。

但不推荐这样做，因为您将成为未经验证的 inserting/manipulation 数据。

示例：

class Client < ActiveRecord::Base
    #has_many :contracts
    #validates_cpf_or_cnpj :cpf_or_cnpj
    #validates_uniqueness_of :cpf_or_cnpj, message: "exists."
    #validates_uniqueness_of :rg, message: "exists."

Rails：当记录不存在时记录存在回滚

Rails: Record Exists Rollback when Record doesn't exist

activerecord

ruby-on-rails