Question

我目前有以下三种型号：

class Vacancy < ActiveRecord::Base
  # Database Associations
  has_many :vacancy_occupations, :foreign_key => :vacancy_id
  has_many :occupations, :through => :vacancy_occupations
  belongs_to :country
  belongs_to :employer

  # Database Validations
  validates_presence_of :name, :title, :description
end

class VacancyOccupation < ActiveRecord::Base
  belongs_to :vacancy, :foreign_key => :vacancy_id
  belongs_to :occupation, :foreign_key => :concept_id
end

class Occupation < Concept
end

class Concept < ActiveRecord::Base
  # Database Associations
  has_many :labels
  has_many :vacancy_occupations, :foreign_key => :concept_id
  has_many :cv_occupations, :foreign_key => :concept_id
  has_many :vacancies, :through => :vacancy_occupations
  has_many :cvs, :through => :cv_occupations

  # Database Validations
  validates_presence_of :uri
  validates_uniqueness_of :uri
end

我正在寻找一种机制来选择具有特定职业的所有职位空缺。目前我可以通过以下声明得到它：

@vacancies = Vacancy.joins(:vacancy_occupations).where('vacancy_occupations.concept_id' => occupation_ids).uniq

但我想知道是否有更清晰的语法来完成这项工作？一直在玩包含选项，尝试从不同的模型作为起点，但我似乎失去了绝望。

Answer 1

我不确定这是否是正确的语法，但如果你能得到所有职业的父母，你基本上会得到所有职业空缺的清单。

Occupation.all.vacancies

Answer 2

您可以使用范围来获得更清晰的语法

通过关联查找模型

2 个答案: