Added Array#extract_options! to encapsulate the pattern of getting an options hash out of a variable number of parameters (closes #8759) [norbert]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7217 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 19 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/array/extract_options.rb b/activesupport/lib/active_support/core_ext/array/extract_options.rb
new file mode 100644
index 0000000000..980d36400b
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/array/extract_options.rb
@@ -0,0 +1,19 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Array #:nodoc:
+      module ExtractOptions
+        # Extract options from a set of arguments. Removes and returns the last element in the array if it's a hash, otherwise returns a blank hash.
+        #
+        #   def options(*args)
+        #     args.extract_options!
+        #   end
+        #
+        #   options(1, 2)           # => {}
+        #   options(1, 2, :a => :b) # => {:a=>:b}
+        def extract_options!
+          last.is_a?(::Hash) ? pop : {}
+        end
+      end
+    end
+  end
+end