rails--rails/activerecord/test/models/organization.rb

class Organization < ActiveRecord::Base
  has_many :member_details
  has_many :members, through: :member_details

  has_many :authors, primary_key: :name
  has_many :author_essay_categories, through: :authors, source: :essay_categories

  has_one :author, primary_key: :name
  has_one :author_owned_essay_category, through: :author, source: :owned_essay_category

  has_many :posts, through: :author, source: :posts

  scope :clubs, -> { from("clubs") }
end