Rails的嵌套属性：至少需要两个记录 [英] Rails nested attributes: require at least two records

问题描述

我怎样才能让这个被要求至少有两个选项，记录提交产品？

 类产品＆LT;的ActiveRecord :: Base的
  belongs_to的：用户
  的has_many：选项：依赖=＆GT; ：破坏
  accepts_nested_attributes_for：选项：allow_destroy =＆GT; ：真正的，：reject_if =＆GT; PROC {| ATTRS | attrs.all？ {| K，V | v.blank？ }}
  validates_ presence_of：USER_ID，：created_at
  验证：描述：presence =＆GT;如此，：长度=＆GT; {：最小=＆GT; 0：最大=＆GT; 500}
结束

一流的选项＆LT;的ActiveRecord :: Base的
  belongs_to的：产品
  验证：姓名，：长度=＆GT; {：最小=＆GT; 0：最大=＆GT; 60}
结束
 

解决方案

 类产品＆LT;的ActiveRecord :: Base的
  ＃......所有其他的东西
  验证：require_two_options

  私人
    高清require_two_options
      errors.add（：基地，你必须至少提供两个选项），如果options.size＆LT; 2
    结束
结束
 

How can I make it so that at least two option records are required to submit a product?

class Product < ActiveRecord::Base
  belongs_to :user
  has_many :options, :dependent => :destroy
  accepts_nested_attributes_for :options, :allow_destroy => :true, :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
  validates_presence_of :user_id, :created_at
  validates :description, :presence => true, :length => {:minimum => 0, :maximum => 500}
end

class Option < ActiveRecord::Base
  belongs_to :product
  validates :name, :length => {:minimum => 0, :maximum => 60}                  
end

解决方案

class Product < ActiveRecord::Base
  #... all your other stuff
  validate :require_two_options

  private
    def require_two_options
      errors.add(:base, "You must provide at least two options") if options.size < 2
    end
end

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