vendor/rails/activesupport/lib/active_support/core_ext/symbol.rb

   1 unless :to_proc.respond_to?(:to_proc)
   2   class Symbol
   3     # Turns the symbol into a simple proc, which is especially useful for enumerations. Examples:
   4     #
   5     #   # The same as people.collect { |p| p.name }
   6     #   people.collect(&:name)
   7     #
   8     #   # The same as people.select { |p| p.manager? }.collect { |p| p.salary }
   9     #   people.select(&:manager?).collect(&:salary)
  10     def to_proc
  11       Proc.new { |*args| args.shift.__send__(self, *args) }
  12     end
  13   end
  14 end