具有多对多关系的Rails 4自定义验证 [英] Rails 4 custom validation with many-to-many relationship

问题描述

我有一个带有模型的应用程序，其中处方通过关系表与药品联系在一起.我使用一种形式创建具有5种关系的一张处方，其中包含有关medicine_id，金额，每日等信息.但是，药表有很多信息，这就是我想在验证时使用的信息.

I've got app with model where prescriptions are connected with medicines via relations table. I use one form to create one prescription with 5 relations which contains information about medicine_id, amount, daily and so on. However, medicine table has got a lot more information and thats what I would like to use when validating.

例如-我想检查表 medicines 中的字段 dose 是否类似于''％pills'.如果是这样，我想做一些计算来检查用户在填写表格时输入的量是否在范围内(假设30-40只对这种特定药物正确)

For example - I want to check if field dose from table medicines is like `'%pills'. If so, I would like to do some calculation to check if an amount that user put during filling the form is in range (lets say 30-40 is only correct for this specific medicine)

我的关系模型:

class Relation < ActiveRecord::Base
    belongs_to :prescription
  belongs_to :medicine

  validates :amount, numericality: {only_integer: true, :greater_than_or_equal_to => 1 }
  validates :daily, numericality: {only_integer: true, :greater_than_or_equal_to => 1 }
  validates :period_in_days, numericality: {only_integer: true, :greater_than_or_equal_to => 1 }

  validate :amount_limit, :if => :pills_form?

  private

    def amount_limit

    end

    def pills_form

    end
end

我在验证关系时如何获得药物表中的这些信息?还是有其他更合适的方式做到这一点?

How can I get these informations that are in the medicine table when Im validating relations? Or is there any other, more proper way of doing this?

推荐答案

感谢@BroiSatse

Aswer thanks to the @BroiSatse

class Relation < ActiveRecord::Base
  belongs_to :prescription
  belongs_to :medicine

  validates :amount, numericality: {only_integer: true, :greater_than_or_equal_to => 1 }
  validates :daily, numericality: {only_integer: true, :greater_than_or_equal_to => 1 }

  validate :amount_limit, :if => :pills_form?

  private

    def amount_limit
      max_amount = self.daily * 90
      in_box_amount = medicine.cardinality.scan(/\d+/).first
      sum = self.amount * in_box_amount.to_i
      if sum > max_amount
        errors.add(:amount, "An amount of medicine cannot exceed 90 days of treatment.")
      end
    end

    def pills_form?
      pill_form_array = ['plaster' , 'globul', 'czop', 'guma', 'tablet', 'pastyl', 'kaps', 'lamel']
      pill_form_array.any? { |item| medicine.form =~ /#{item}/ }
    end
end

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