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Versions: 16
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Stored size: 1.59 KB
Contents
class Species < ActiveRecord::Base
set_primary_key :name
scope :thoroughly_researched, :conditions => 'marginal_dietary_requirement IS NOT NULL'
falls_back_on :diet_emission_intensity => lambda { weighted_average :diet_emission_intensity, :weighted_by => :population }, # kg CO2 / joule
:marginal_dietary_requirement => lambda { Species.marginal_dietary_requirement_fallback },
:fixed_dietary_requirement => 0, # force a zero intercept to be respectful of our tiny tiny animal friends
:weight => lambda { weighted_average :weight, :weighted_by => :population } # kg
data_miner do
tap "Brighter Planet's species data", Earth.taps_server
end
class << self
def [](name)
find_by_name name.to_s
end
def marginal_dietary_requirement_fallback
total_diet_size = thoroughly_researched.map(&:weighted_diet_size).sum
total_population = thoroughly_researched.sum(:population)
return 0.0 unless total_population > 0.0
average_weight = thoroughly_researched.weighted_average(:weight, :weighted_by => :population)
return 0.0 unless average_weight > 0.0
(total_diet_size / total_population) / average_weight
end
end
def diet_size
return unless weight and marginal_dietary_requirement and fixed_dietary_requirement
weight * marginal_dietary_requirement + fixed_dietary_requirement
end
def weighted_diet_size
return unless _diet_size = diet_size and _population = population
_diet_size * _population
end
def to_s
name
end
def cat?
eql? self.class[:cat]
end
end
Version data entries
16 entries across 16 versions & 1 rubygems