Add Object#with_options for DRYing up multiple calls to methods having shared options

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3314 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 25 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/option_merger.rb b/activesupport/lib/active_support/option_merger.rb
new file mode 100644
index 0000000000..51a2ea1328
--- /dev/null
+++ b/activesupport/lib/active_support/option_merger.rb
@@ -0,0 +1,25 @@
+module ActiveSupport
+  class OptionMerger #:nodoc:
+    instance_methods.each do |method| 
+      undef_method(method) if method !~ /^(__|instance_eval)/
+    end
+    
+    def initialize(context, options)
+      @context, @options = context, options
+    end
+    
+    private
+      def method_missing(method, *arguments, &block)
+        merge_argument_options! arguments
+        @context.send(method, *arguments, &block)
+      end
+      
+      def merge_argument_options!(arguments)
+        arguments << if arguments.last.respond_to? :merge!
+          arguments.pop.dup.merge!(@options)
+        else
+          @options.dup
+        end  
+      end
+  end
+end