From cf6dc4378388d046ecc2bca8e1658ee253918d82 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Luciano=20Germ=C3=A1n=20Panaro?= <luciano.panaro@gmail.com>
Date: Fri, 21 Nov 2008 12:29:53 -0200
Subject: [PATCH] Added Object#try_* using method_missing

---
 .../lib/active_support/core_ext/object/misc.rb     |   28 +++++++++++++++----
 .../test/core_ext/object_and_class_ext_test.rb     |   16 +++++++++++
 2 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/activesupport/lib/active_support/core_ext/object/misc.rb b/activesupport/lib/active_support/core_ext/object/misc.rb
index 50f824c..778ce13 100644
--- a/activesupport/lib/active_support/core_ext/object/misc.rb
+++ b/activesupport/lib/active_support/core_ext/object/misc.rb
@@ -72,16 +72,32 @@ class Object
     respond_to? "acts_like_#{duck}?"
   end
 
-  # Tries to send the method only if object responds to it. Return +nil+ otherwise.
-  # 
+  # Tries to send the method only if object responds to it. Return +nil+ otherwise. Accepts calls with arguments and blocks.
+  # Can also be used as dynamic method: try_a_method
+  #
   # ==== Example :
   # 
-  # # Without try
+  # #Without try
   # @person ? @person.name : nil
   # 
-  # With try
+  # #With try
   # @person.try(:name)
-  def try(method)
-    send(method) if respond_to?(method, true)
+  #
+  # #With dynamic try
+  # @person_try_name
+  #
+  # #With arguments and block
+  # 'Hello'.try(:sub, 'llo') { |match| 'y' } #returns 'Hey'
+  def try(method, *args, &block)
+    send(method, *args, &block) if respond_to?(method, true)
+  end
+
+  # Allow try to be accessed with "try_method"
+  def method_missing(method_id, *args, &block)
+    if method_id.to_s =~ /^try_(\w+)$/
+      try($1, *args, &block)      
+    else
+      super
+    end
   end
 end
diff --git a/activesupport/test/core_ext/object_and_class_ext_test.rb b/activesupport/test/core_ext/object_and_class_ext_test.rb
index fbdce56..ad0351a 100644
--- a/activesupport/test/core_ext/object_and_class_ext_test.rb
+++ b/activesupport/test/core_ext/object_and_class_ext_test.rb
@@ -271,4 +271,20 @@ class ObjectTryTest < Test::Unit::TestCase
     assert_equal 5, @string.try(:size)
   end
 
+  def test_argument_forwarding
+    assert_equal 'Hey', @string.try(:sub, 'llo', 'y')
+  end
+
+  def test_block_forwarding
+    assert_equal 'Hey', @string.try(:sub, 'llo') { |match| 'y' }
+  end
+
+  def test_dynamic_existing_method
+    assert_equal 'Hey', @string.try_sub('llo') { |match| 'y' }
+  end
+
+  def test_dynamic_nonexisting_method
+    assert_nil @string.try_undefined_method 
+  end
+
 end
-- 
1.5.6.3