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

   1 class Object
   2   # Invokes the method identified by the symbol +method+, passing it any arguments
   3   # and/or the block specified, just like the regular Ruby <tt>Object#send</tt> does.
   4   #
   5   # *Unlike* that method however, a +NoMethodError+ exception will *not* be raised
   6   # and +nil+ will be returned instead, if the receiving object is a +nil+ object or NilClass.
   7   #
   8   # ==== Examples
   9   #
  10   # Without try
  11   #   @person && @person.name
  12   # or
  13   #   @person ? @person.name : nil
  14   #
  15   # With try
  16   #   @person.try(:name)
  17   #
  18   # +try+ also accepts arguments and/or a block, for the method it is trying
  19   #   Person.try(:find, 1)
  20   #   @people.try(:collect) {|p| p.name}
  21   #--
  22   # This method definition below is for rdoc purposes only. The alias_method call
  23   # below overrides it as an optimization since +try+ behaves like +Object#send+,
  24   # unless called on +NilClass+.
  25   def try(method, *args, &block)
  26     send(method, *args, &block)
  27   end
  28   remove_method :try
  29   alias_method :try, :__send__
  30 end
  31
  32 class NilClass
  33   def try(*args)
  34     nil
  35   end
  36 end