Org list models

models.rb

# app/models/organization.rb
class Organization < ApplicationRecord
  has_many :hqs
  has_many :stores, through: :hqs
end

# app/models/country.rb
class Country < ApplicationRecord
end

# app/models/hq.rb
class Hq < ApplicationRecord
  belongs_to :organization
  belongs_to :country
  has_many :stores
end

# app/models/store.rb
class Store < ApplicationRecord
  belongs_to :hq
end