如何调用模块中的 class 特定方法

Question

我正在做这个

class Enrollment < ApplicationRecord
  belongs_to :user
  validate :no_conflict

  private
  def no_conflict
    user.enrollments.where.not(id: self).each do |e|
      errors.add(:start_time, 'conflicts with another schedule') if true
    end
  end
end

class Availability < ApplicationRecord
  belongs_to :user
  validate :no_conflict

  private
  def no_conflict
    user.availabilities.where.not(id: self).each do |a|
      errors.add(:start_time, 'conflicts with another schedule') if true
    end
  end
end

由于两个模型中有相同的代码，我试图将其移至这样的关注点

class Enrollment < ApplicationRecord
  include Schedulize
end

class Availability < ApplicationRecord
  include Schedulize
end

module Schedulize
  extend ActiveSupport::Concern
    
  included do
    belongs_to :user
    validate :no_conflict
  end
    
  private
  def no_conflict
    user.<???>.where.not(id: self).each do |x|
      errors.add(:start_time, 'conflicts with another schedule') if true
    end
  end
end

我不确定如何让模块调用包含它的 class 方法（问号在上方）。有人能帮我指明正确的方向吗

Answer 1

你可以这样做：

def no_conflict
  user.send(self.class.table_name).where.not(id: self).each do |x|
    errors.add(:start_time, 'conflicts with another schedule') if true
  end
end

self.class.table_name 将 return enrollments & availabilities 按照惯例。如果模型中的关系名称与 table 名称不同，您可以尝试不同的名称。

如何调用模块中的 class 特定方法

How to call a class specific method in a module

ruby

activerecord

ruby-on-rails