Class: Species

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

Constant Summary collapse

TABLE_STRUCTURE = 
<<-EOS

CREATE TABLE species
  (
     name                               CHARACTER VARYING(255) NOT NULL PRIMARY KEY,
     population                         INTEGER,
     diet_emission_intensity            FLOAT,
     diet_emission_intensity_units      CHARACTER VARYING(255),
     weight                             FLOAT,
     weight_units                       CHARACTER VARYING(255),
     marginal_dietary_requirement       FLOAT,
     marginal_dietary_requirement_units CHARACTER VARYING(255),
     fixed_dietary_requirement          FLOAT,
     fixed_dietary_requirement_units    CHARACTER VARYING(255),
     minimum_weight                     FLOAT,
     minimum_weight_units               CHARACTER VARYING(255),
     maximum_weight                     FLOAT,
     maximum_weight_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

.[](name) ⇒ Object 



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# File 'lib/earth/pet/species.rb', line 43

def [](name)
  find_by_name name.to_s
end

.marginal_dietary_requirement_fallback ⇒ Object 



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# File 'lib/earth/pet/species.rb', line 47

def marginal_dietary_requirement_fallback
  total_diet_size = thoroughly_researched.map(&:weighted_diet_size).sum.to_f
  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

Instance Method Details

#cat? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/earth/pet/species.rb', line 71

def cat?
  eql? self.class[:cat]
end

#diet_size ⇒ Object 



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# File 'lib/earth/pet/species.rb', line 57

def diet_size
  return unless weight and marginal_dietary_requirement and fixed_dietary_requirement
  weight.to_f * marginal_dietary_requirement + fixed_dietary_requirement
end

#to_s ⇒ Object 



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# File 'lib/earth/pet/species.rb', line 67

def to_s
  name
end

#weighted_diet_size ⇒ Object 



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# File 'lib/earth/pet/species.rb', line 62

def weighted_diet_size
  return unless _diet_size = diet_size and _population = population
  _diet_size.to_f * _population
end