Merged updates from trunk into stable branch

[feedcatcher.git] / vendor / rails / activesupport / lib / active_support / core_ext / try.rb

diff --git a/vendor/rails/activesupport/lib/active_support/core_ext/try.rb b/vendor/rails/activesupport/lib/active_support/core_ext/try.rb
new file mode 100644 (file)
index 0000000..3de198d
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/core_ext/try.rb
@@ -0,0 +1,36 @@
+class Object
+  # Invokes the method identified by the symbol +method+, passing it any arguments 
+  # and/or the block specified, just like the regular Ruby <tt>Object#send</tt> does.
+  #
+  # *Unlike* that method however, a +NoMethodError+ exception will *not* be raised 
+  # and +nil+ will be returned instead, if the receiving object is a +nil+ object or NilClass.
+  #
+  # ==== Examples
+  #
+  # Without try
+  #   @person && @person.name
+  # or
+  #   @person ? @person.name : nil
+  #
+  # With try
+  #   @person.try(:name)
+  #
+  # +try+ also accepts arguments and/or a block, for the method it is trying
+  #   Person.try(:find, 1)
+  #   @people.try(:collect) {|p| p.name}
+  #--
+  # This method definition below is for rdoc purposes only. The alias_method call 
+  # below overrides it as an optimization since +try+ behaves like +Object#send+,
+  # unless called on +NilClass+.
+  def try(method, *args, &block)
+    send(method, *args, &block)
+  end
+  remove_method :try
+  alias_method :try, :__send__
+end
+
+class NilClass
+  def try(*args)
+    nil
+  end
+end