Added IndifferentAccess as a way to wrap a hash by a symbol-based store that also can be accessed by string keys

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@581 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

3 files changed, 40 insertions, 1 deletions

diff --git a/activesupport/lib/core_ext/hash.rb b/activesupport/lib/core_ext/hash.rb
index a5c53db1e0..e899d3e1e2 100644
--- a/activesupport/lib/core_ext/hash.rb
+++ b/activesupport/lib/core_ext/hash.rb
@@ -1,5 +1,7 @@
 require File.dirname(__FILE__) + '/hash/keys'
+require File.dirname(__FILE__) + '/hash/indifferent_access'
 
 class Hash #:nodoc:
   include ActiveSupport::CoreExtensions::Hash::Keys
+  include ActiveSupport::CoreExtensions::Hash::IndifferentAccess
 end
diff --git a/activesupport/lib/core_ext/hash/indifferent_access.rb b/activesupport/lib/core_ext/hash/indifferent_access.rb
new file mode 100644
index 0000000000..3fe0999866
--- /dev/null
+++ b/activesupport/lib/core_ext/hash/indifferent_access.rb
@@ -0,0 +1,38 @@
+class HashWithIndifferentAccess < Hash
+  def initialize(constructor)
+    if constructor.is_a?(Hash)
+      super()
+      update(constructor.symbolize_keys)
+    else
+      super(constructor)
+    end
+  end
+  
+  alias_method :regular_read, :[]
+  
+  def [](key)
+    case key
+      when Symbol: regular_read(key) || regular_read(key.to_s)
+      when String: regular_read(key) || regular_read(key.to_sym)
+      else regular_read(key)
+    end
+  end
+
+  alias_method :regular_writer, :[]=
+  
+  def []=(key, value)
+    regular_writer(key.is_a?(String) ? key.to_sym : key, value)
+  end
+end
+
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Hash #:nodoc:
+      module IndifferentAccess
+        def with_indifferent_access
+          HashWithIndifferentAccess.new(self)
+        end
+      end
+    end
+  end
+end
diff --git a/activesupport/lib/core_ext/hash/keys.rb b/activesupport/lib/core_ext/hash/keys.rb
index 536995dd71..4dd982337c 100644
--- a/activesupport/lib/core_ext/hash/keys.rb
+++ b/activesupport/lib/core_ext/hash/keys.rb
@@ -2,7 +2,6 @@ module ActiveSupport #:nodoc:
   module CoreExtensions #:nodoc:
     module Hash #:nodoc:
       module Keys
-
         # Return a new hash with all keys converted to symbols.
         def symbolize_keys
           inject({}) do |options, (key, value)|