# Active record validations :: 如何验证 Rails(custom_validations) 中的日期属性？

Question

我有两个模型...

models/Resident.rb : has_many: 叶

models/leave.rb: belongs_to: 居民

现在我想在模型属性创建之前验证离开模型属性..

leave.rb 属性 : start_date,end_date,目的地

这是我的请假模型:

class Leave < ActiveRecord::Base
  belongs_to :resident
  validates :destination,presence:true
  validates :end_date,presence: true
  validates :start_date,presence: true
  before_create :check_correct_leave

  private

  def check_correct_leave

   if resident.hostel.hostel=='J'
     (self.end_date - self.start_date).to_i == 4 ||  (self.end_date - self.start_date).to_i == 5

   else
     errors.add(:start_date, "Leave are granted only 4 or 5 days")
   end

  end

end

我想要 check_correct_leave 方法也检查 --> 居民是否已经有那个月的休假（存储在休假模型中）（月表示1 月、2 月等）然后它应该生成一个错误：

"You can't mark leave cause you have already marked leave for this month" 并且模型不应该存储那个假。谢谢！

Answer 1

def has_leave_for_the_same_month?
  resident.leaves.any? do |other_leave|
    other_leave.start_date.month == leave.start_date.month
  end
end

errors.add(...) if has_leave_for_the_same_month?

Answer 2

您可以像这样添加另一种验证方法

validate :check_leaves_in_same_month


def check_leaves_in_same_month  
   if self.resident.leaves.where('start_date > ?', self.start_date.beginning_of_month).any? 
       errors.add("You can't mark leave cause you have already marked leave for this month")
   end
end

# Active record validations :: 如何验证 Rails(custom_validations) 中的日期属性？

# Active record validations : : How to validate date attributes in Rails(custom_validations)?

ruby

activerecord

ruby-on-rails

activemodel

ruby-on-rails-3