Module: Enumerable

Defined in:
lib/libisi.rb

Overview

from activesupport-1.3.1/lib/active_support/core_ext/enumerable.rb

Instance Method Summary collapse

Instance Method Details

#group_by ⇒ Object 



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# File 'lib/libisi.rb', line 889

def group_by
  inject({}) do |groups, element|
    (groups[yield(element)] ||= []) << element
    groups
  end
end

#group_bys(*args) ⇒ Object 



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# File 'lib/libisi.rb', line 896

def group_bys(*args)
  if args[-1].class == Hash
    options = args[-1]
    functions = args[0..-2]
  else
    options = {}
    functions = args
  end

  of = ((options[:order_functions] and options[:order_functions][0]) or
 lambda {|e| 
   if e.respond_to?(:"<=>") then
     e
   else
     e.to_s
   end
 }
 )

  if (gf = functions[0])
    unordered = self.group_by(&gf)            
    # TODO: Would be good but problems with base table
    #res = OrderedHash.new
    res = []
    begin
      ordered_keys = unordered.keys.sort_by{|k| of.call(k)}
    rescue
      $log.warn("Error ocurred sorting keys: #{$!}!")
      ordered_keys = unordered.keys
    end

    ordered_keys.each {|key|
	# TODO: Would be good but problems with base table
	#res[key] = unordered[key].group_bys(*functions[1..-1])
	res << [key, unordered[key].group_bys(*functions[1..-1])]
    }
    
  else
    res = self
  end
  
  res
end