如何比较不同的模型与不同的模型?

时间:2013-01-19 19:20:18

标签: ruby ruby-on-rails-3

我有两个模型约会和时间表,在预约中我有一个名为adate的时间字段,在计划中我有start_time和end end_time字段。

我想将adate中的值与start_time和end_time中的值进行比较,看看是否可以在该时间进行约会。

如何比较这些值?

  create_table "appointments", :force => true do |t|
    t.integer  "doctor_id"
    t.date     "adate"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
    t.time     "atime"
  end

  create_table "schedules", :force => true do |t|
    t.string   "day"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
    t.integer  "doctor_id"
    t.time     "start_time"
    t.time     "end_time"
  end

应该是验证,但我应该实现吗?

模型

class Appointment < ActiveRecord::Base
  attr_accessible :adate, :atime, :doctor_id  
  validates :adate, :presence => true     
  belongs_to :doctor
  validates_date :adate, :after => lambda { Date.current }  
end

class Schedule < ActiveRecord::Base
  attr_accessible :doctor_id, :day, :end_time, :start_time  
  belongs_to :doctor
end

1 个答案:

答案 0 :(得分:1)

http://guides.rubyonrails.org/active_record_validations_callbacks.html#custom-methods开始,您可以看到如何编写任意方法进行验证。

在你的情况下,你可能会写一些这种形式。

class Appointment < ActiveRecord::Base
    # ... All the other stuff
    validate :appointment_time_is_valid_for_day

    def appointment_time_is_valid_for_day
        # TODO: Get the schedule for that day/doctor.
        unless schedule.start_time <= atime and
          atime <= schedule.end_time
            errors.add(:atime, "Doctor's not in at this time")
        end
    end
end

这假设您已经有一些方法可以在预约当天获得医生的时间表。我对你的模型不太了解,告诉你如何做到这一点。