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authorPratik Naik <pratiknaik@gmail.com>2008-11-19 19:36:42 +0530
committerPratik Naik <pratiknaik@gmail.com>2008-11-19 19:36:42 +0530
commit51730792ca930a896361eb92354a42bc56903de1 (patch)
treeda1992628081de9c2c0f09b64e1d55893d6e2bcd /activesupport
parent51a19ae2bf33e66b23ff5c91bf584b2efa9e669f (diff)
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Added Object#try. ( Taken from http://ozmm.org/posts/try.html ) [Chris Wanstrath]
Diffstat (limited to 'activesupport')
-rw-r--r--activesupport/CHANGELOG2
-rw-r--r--activesupport/lib/active_support/core_ext/object/misc.rb13
-rw-r--r--activesupport/test/core_ext/object_and_class_ext_test.rb25
3 files changed, 40 insertions, 0 deletions
diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index 5997b7daaf..0717d344d7 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,7 @@
*2.3.0 [Edge]*
+* Added Object#try. ( Taken from http://ozmm.org/posts/try.html ) [Chris Wanstrath]
+
* Added Enumerable#none? to check that none of the elements match the block #1408 [Damian Janowski]
* TimeZone offset tests: use current_period, to ensure TimeZone#utc_offset is up-to-date [Geoff Buesing]
diff --git a/activesupport/lib/active_support/core_ext/object/misc.rb b/activesupport/lib/active_support/core_ext/object/misc.rb
index cd0a04d32a..50f824c358 100644
--- a/activesupport/lib/active_support/core_ext/object/misc.rb
+++ b/activesupport/lib/active_support/core_ext/object/misc.rb
@@ -71,4 +71,17 @@ class Object
def acts_like?(duck)
respond_to? "acts_like_#{duck}?"
end
+
+ # Tries to send the method only if object responds to it. Return +nil+ otherwise.
+ #
+ # ==== Example :
+ #
+ # # Without try
+ # @person ? @person.name : nil
+ #
+ # With try
+ # @person.try(:name)
+ def try(method)
+ send(method) if respond_to?(method, true)
+ 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 e88dcb52d5..fbdce56ac2 100644
--- a/activesupport/test/core_ext/object_and_class_ext_test.rb
+++ b/activesupport/test/core_ext/object_and_class_ext_test.rb
@@ -247,3 +247,28 @@ class ObjectInstanceVariableTest < Test::Unit::TestCase
[arg] + instance_exec('bar') { |v| [reverse, v] } }
end
end
+
+class ObjectTryTest < Test::Unit::TestCase
+ def setup
+ @string = "Hello"
+ end
+
+ def test_nonexisting_method
+ method = :undefined_method
+ assert !@string.respond_to?(method)
+ assert_nil @string.try(method)
+ end
+
+ def test_valid_method
+ assert_equal 5, @string.try(:size)
+ end
+
+ def test_valid_private_method
+ class << @string
+ private :size
+ end
+
+ assert_equal 5, @string.try(:size)
+ end
+
+end