Question

我有带有电子邮件字段的构建器和用户模型，我想在两个模型中使电子邮件成为唯一的。当我放入Builder模型而不是用户模型时，验证方法下面的工作正常。

class User < ActiveRecord::Base
devise :database_authenticatable, :registerable,:recoverable, :rememberable, :trackable, :validatable, :confirmable
attr_accessible :email, :password, :password_confirmation, :remember_me,:confirmation_token, :confirmed_at, :confirmation_sent_at, :unconfirmed_email, :provider,:uid, :name, :oauth_token, :oauth_expires_at
validate :check_email_exists

def check_email_exists
if Builder.exists?(:email => self.email)
  errors.add(:email,"User already exists with this email, try another email")
end
end

错误是：

NoMethodError in Devise::RegistrationsController#create 

app/models/user.rb:30:in `check_email_exists'

{"utf8"=>"✓",
"authenticity_token"=>"EiFhJta51puZ7HZA3YzhopsKL2aJWllkl8geo3cL3gc=",
"user"=>{"email"=>"builder@gmail.com",
"password"=>"[FILTERED]",
"password_confirmation"=>"[FILTERED]"},
"commit"=>"Sign up"}

错误的原因是什么？我试图解决它很多天但没有成功。

这是我的构建器模型

class Builder < ActiveRecord::Base
devise :database_authenticatable, :registerable,
attr_accessible :email, :password, :password_confirmation, :remember_me,

validate :email_exists

def email_exists
if User.exists?(:email => self.email)
  errors.add(:email,"User already exists with this email, try another email")
end
end

让abc@gmail.com已经存在于User，Builder注册表单将告诉用户已经存在尝试另一封电子邮件如果我在Builder注册表单中使用abc@gmail.com注册，这意味着email_exists工作正常构建器模型，但如果我签入用户模型，为什么抛出错误，尽管代码是正确的。

class User < ActiveRecord::Builder

发生错误：退出 /home/rails/Desktop/realestate/app/models/user.rb:1:in <top (required)>': uninitialized constant ActiveRecord::Builder (NameError) from /home/rails/.rvm/gems/ruby-1.9.3-p448/gems/activesupport-3.2.13/lib/active_support/inflector/methods.rb:230:in阻止constantize'

Answer 1

从Builder引用的错误看起来是指在ActiveRecord范围中定义的ActiveRecord::Associations::Builder模块。

尝试使用::Builder访问您的模型，所以：

  if ::Builder.exists?(email: email)

Answer 2

为什么不使用默认验证来实现唯一性

class User < ActiveRecord::Base
  ...
  validates :email, :uniqueness => true, :message => "User already exists with this email, try another email"
  ...
end

同样在上面提到的代码中，您应该使用User模型而不是Builder

class User < ActiveRecord::Base
  ...
  def check_email_exists
    if User.exists?(:email => self.email)
      errors.add(:email,"User already exists with this email, try another email")
    end
  end 
  ...
end

未定义的方法`存在？' for ActiveRecord :: Associations :: Builder：Module

2 个答案: