我可以在 Rails 中同时验证两个模型中的电子邮件吗？

Question

我有一个客户端模型，当我创建一个新客户端时，它会使用客户端电子邮件创建一个用户。当我创建会员时也会发生同样的事情。我可以同时在客户端和用户中使用 validates_uniqueness_of 电子邮件吗？

或者我应该做一些类似的事情，在保存之前检查是否有用户使用相同的电子邮件，然后打印错误？

我试过了，还是不行

validate :uniqueness_of_user

  private

  def uniqueness_of_user
    @user = User.find_by_email(:email)
    if @user.present?
      errors.add(:email, "Bang!")
    end
  end

编辑：

这是控制器：

def create
    @affiliate = Affiliate.new(affiliate_params)
    respond_to do |format|
      if verify_recaptcha(model: @affiliate) && @affiliate.save
        @user = User.create!(user_parameter)
        pplicationMailer.confirmation(@affiliate).deliver_now

        format.html {redirect_to :back, notice: 'Thanks for your submission, we will be in touch shortly. Check your email for your affiliate number and password.' }
        format.json { render :show, status: :created, location: @affiliate }
      else
        format.html { render :signup, layout: "sign-ups"  }
        format.json { render json: @affiliate.errors, status: :unprocessable_entity }
      end
    end
  end

Answer 1

我宁愿将 email_address 保存在不同的表中。例如：地址

class Address < ApplicationRecord

   belongs_to :affilat
   belongs_to :client

   validates :email,
              presence: true 
              uniqueness: true
end

并在此处使用嵌套形式保存日期。

Answer 2

查看下面的代码以获取有关此案例的好文章，我复制了代码，但要查看完整的解释，请查看文章链接：

# app/models/concerns/validate_identifier_uniqueness_across_models.rb
module ValidateIdentifierUniquenessAcrossModels
  extend ActiveSupport::Concern

  @@included_classes = []

  included do
    @@included_classes << self
    validate :identifier_unique_across_all_models
  end

  private

  def identifier_unique_across_all_models
    return if self.identifier.blank?
    @@included_classes.each do |klass|
      scope = klass.where(identifier: self.identifier)
      if self.persisted? && klass == self.class
        scope = scope.where('id != ?', self.id)
      end
      if scope.any?
        self.errors.add :identifier, 'is already taken'
        break
      end
    end
  end
end

# app/models/product.rb
class Product < ActiveRecord::Base
  include ValidateIdentifierUniquenessAcrossModels
end

# app/models/category.rb
class Category < ActiveRecord::Base
  include ValidateIdentifierUniquenessAcrossModels
end

参考：
https://www.krautcomputing.com/blog/2015/03/29/rails-validate-uniqueness-across-models/

更新：
解决方案 1 如果同时保存数据，那么最好将一起保存的数据包含在事务中，如下所示：

  def create
    email_validity
    @affiliate = Affiliate.new(affiliate_params)
    respond_to do |format|
      ActiveRecord::Base.transaction do
        if verify_recaptcha(model: @affiliate) && @affiliate.save

      @user = User.create!(user_parameter)
      if @user.valid?
        ApplicationMailer.confirmation(@affiliate).deliver_now

        format.html {redirect_to :back, notice: 'Thanks for your submission, we will be in touch shortly. Check your email for your affiliate number and password.'}
        format.json {render :show, status: :created, location: @affiliate}
      else
        email_validity = false
        raise ActiveRecord::Rollback
      end
    else

      format.html {render :signup, layout: "sign-ups"}
      format.json {render json: @affiliate.errors, status: :unprocessable_entity}
    end
  end

  if email_validity == false
    respond_to do |format|
      format.html {redirect_to :back, notice: 'Sorry, email is in use!'}
      # you can add your json return as you like
    end
  end
end

结束

参考：
http://api.rubyonrails.org/classes/ActiveRecord/Rollback.html

解决方案 2 在保存到关联公司或创建用户之前，请检查两个表中是否存在控制器中的电子邮件。