Question

I currently have the following three models:

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

I’m looking for a mechanism that selects all vacancies that have a given occupation. Currently I can get it dony by the following statement:

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

But I was wondering if there is a cleaner syntax to get this done? Been playing with the includes options and trying from different models as starting point but I seem to get hopelessly lost.

Answer 1

you may use scopes to get cleaner syntax