Contents

require 'earth/model'

require 'earth/automobile/automobile_type_fuel_year_control'

class AutomobileTypeFuelYear < ActiveRecord::Base
  extend Earth::Model

  TABLE_STRUCTURE = <<-EOS

CREATE TABLE automobile_type_fuel_years
  (
     name                      CHARACTER VARYING(255) NOT NULL PRIMARY KEY,
     type_name                 CHARACTER VARYING(255),
     fuel_family               CHARACTER VARYING(255),
     year                      INTEGER,
     share_of_type             FLOAT,
     annual_distance           FLOAT,
     annual_distance_units     CHARACTER VARYING(255),
     ch4_emission_factor       FLOAT,
     ch4_emission_factor_units CHARACTER VARYING(255),
     n2o_emission_factor       FLOAT,
     n2o_emission_factor_units CHARACTER VARYING(255)
  );

EOS

  self.primary_key = "name"
  
  # Used by Automobile and AutomobileTrip
  def self.find_by_type_name_and_fuel_family_and_closest_year(type_name, fuel_family, year)
    candidates = where(:type_name => type_name, :fuel_family => fuel_family)
    if year > (max_year = candidates.maximum(:year))
      candidates.where(:year => max_year).first
    else
      candidates.where(:year => [year, candidates.minimum(:year)].max).first
    end
  end
  
  # for calculating ch4 and n2o ef
  def type_fuel_year_controls
    AutomobileTypeFuelYearControl.find_all_by_type_name_and_fuel_family_and_closest_year(type_name, fuel_family, year)
  end
  
  warn_unless_size 124
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
earth-1.0.3	lib/earth/automobile/automobile_type_fuel_year.rb
earth-1.0.2	lib/earth/automobile/automobile_type_fuel_year.rb
earth-1.0.1	lib/earth/automobile/automobile_type_fuel_year.rb