Added Hash#stringify_keys and Hash#stringify_keys!

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@586 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

@@ -1,3 +1,5 @@
+* Added Hash#stringify_keys and Hash#stringify_keys!
+
 * Added IndifferentAccess as a way to wrap a hash by a symbol-based store that also can be accessed by string keys
 
 * Added Inflector.humanize to turn attribute names like employee_salary into "Employee salary". Used by automated error reporting in AR.

activesupport/lib/core_ext/hash/keys.rb

@@ -2,6 +2,25 @@ module ActiveSupport #:nodoc:
   module CoreExtensions #:nodoc:
     module Hash #:nodoc:
       module Keys
+        # Return a new hash with all keys converted to strings.
+        def stringify_keys
+          inject({}) do |options, (key, value)|
+            options[key.to_s] = value
+            options
+          end
+        end
+
+        # Destructively convert all keys to strings.
+        def stringify_keys!
+          keys.each do |key|
+            unless key.is_a?(String)
+              self[key.to_s] = self[key]
+              delete(key)
+            end
+          end
+          self
+        end
+
         # Return a new hash with all keys converted to symbols.
         def symbolize_keys
           inject({}) do |options, (key, value)|

activesupport/test/core_ext/hash_ext_test.rb

@@ -12,6 +12,8 @@ class HashExtTest < Test::Unit::TestCase
     h = {}
     assert_respond_to h, :symbolize_keys
     assert_respond_to h, :symbolize_keys!
+    assert_respond_to h, :stringify_keys
+    assert_respond_to h, :stringify_keys!
     assert_respond_to h, :to_options
     assert_respond_to h, :to_options!
   end
@@ -32,6 +34,18 @@ class HashExtTest < Test::Unit::TestCase
     assert_raises(NoMethodError) { { [] => 1 }.symbolize_keys! }
   end
 
+  def test_stringify_keys
+    assert_equal @strings, @symbols.stringify_keys
+    assert_equal @strings, @strings.stringify_keys
+    assert_equal @strings, @mixed.stringify_keys
+  end
+
+  def test_stringify_keys!
+    assert_equal @strings, @symbols.dup.stringify_keys!
+    assert_equal @strings, @strings.dup.stringify_keys!
+    assert_equal @strings, @mixed.dup.stringify_keys!
+  end
+
   def test_indifferent_access
     @strings = @strings.with_indifferent_access
     @symbols = @symbols.with_indifferent_access