Module: Enumerable

Defined in:
lib/support/sort_by_attributes.rb

Instance Method Summary collapse

Instance Method Details

#sort_by_attributes(*atts) ⇒ Object

Provides sorting on multiple attributes (each directional) where atts is an array of symbols. the default is to sort ascending (small to large). the option :down => Symbol or ArrayOfSymbols

sort_by_attributes(:age,:height,:weight) # -> sorts by age, height, and weight
sort_by_attributes(:age,:height,:weight, :down => :height) # -> same as above, but sorts height from large to small
sort_by_attributes(:age,:height,:weight, :down => [:height,:weight]) # -> same as above, but sorts height and weight from large to small



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# File 'lib/support/sort_by_attributes.rb', line 29

def sort_by_attributes(*atts)
  down = 
    if atts.last.is_a? Hash
      hash = atts.pop
      unless hash[:down].is_a?(Array)
        hash[:down] = [hash[:down]]
      end
      Set.new(hash[:down])
    else
      Set.new
    end
  self.sort_by do |obj|
    atts.collect do |att|
      if down.include?(att)
        obj.send(att).rev
      else
        obj.send(att)
      end
    end
  end
end