class CensusDivision < ActiveRecord::Base
  set_primary_key :number
  
  belongs_to :census_region, :foreign_key => 'census_region_number'
  has_many :states, :foreign_key => 'census_division_number'
  has_many :zip_codes, :through => :states
  has_many :climate_divisions, :through => :states
  has_many :residential_energy_consumption_survey_responses, :foreign_key => 'census_division_number'
end