Class: AutomobileFuel

Inherits:
ActiveRecord::Base
  • Object
show all
Extended by:
Earth::Model
Defined in:
lib/earth/automobile/automobile_fuel.rb

Constant Summary collapse

TABLE_STRUCTURE = 
<<-EOS

CREATE TABLE automobile_fuels
  (
     name                               CHARACTER VARYING(255) NOT NULL PRIMARY KEY,
     code                               CHARACTER VARYING(255),
     family                             CHARACTER VARYING(255),
     distance_key                       CHARACTER VARYING(255),
     base_fuel_name                     CHARACTER VARYING(255),
     blend_fuel_name                    CHARACTER VARYING(255),
     blend_portion                      FLOAT,                  /* the portion of the blend that is the blend fuel */
     annual_distance                    FLOAT,
     annual_distance_units              CHARACTER VARYING(255),
     energy_content                     FLOAT,
     energy_content_units               CHARACTER VARYING(255),
     co2_emission_factor                FLOAT,
     co2_emission_factor_units          CHARACTER VARYING(255),
     co2_biogenic_emission_factor       FLOAT,
     co2_biogenic_emission_factor_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),
     total_consumption                  FLOAT,                  /* for calculating fallback blend_portion */
     total_consumption_units            CHARACTER VARYING(255)
  );

EOS

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Earth::Model

extend_mining, extended, registry

Class Method Details

.determine_fallback(method) ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 62

def determine_fallback(method)
  if method =~ /units/
    gasoline.send(method)
  else
    (fallback_blend_portion * diesel.send(method)) + ((1 - fallback_blend_portion) * gasoline.send(method))
  end
end

.diesel ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 50

def diesel
  find 'diesel'
end

.fallback_blend_portion ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 58

def fallback_blend_portion
  diesel.total_consumption / (diesel.total_consumption + gasoline.total_consumption)
end

.gasoline ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 54

def gasoline
  find 'gasoline'
end

Instance Method Details

#non_liquid? ⇒ Boolean

Used by Automobile and AutomobileTrip to determine whether need to convert fuel efficiency units

Returns:

  • (Boolean) 


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# File 'lib/earth/automobile/automobile_fuel.rb', line 72

def non_liquid?
  energy_content_units != 'megajoules_per_litre'
end

#same_as?(other_auto_fuel) ⇒ Boolean

Used by Automobile and AutomobileTrip to check whether user-input fuel matches one of the vehicle’s fuels

Returns:

  • (Boolean) 


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# File 'lib/earth/automobile/automobile_fuel.rb', line 77

def same_as?(other_auto_fuel)
  unless other_auto_fuel.nil?
    if ['G', 'R', 'P'].include? self.code
      ['G', 'R', 'P'].include? other_auto_fuel.code
    else
      self == other_auto_fuel
    end
  end
end

#suffix ⇒ Object

for AutomobileMakeModel.custom_find



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# File 'lib/earth/automobile/automobile_fuel.rb', line 88

def suffix
  case code
  when 'D', 'BP-B5', 'BP-B20', 'BP-B100'
    'DIESEL'
  when 'E'
    'FFV'
  when 'C'
    'CNG'
  end
end