Ensure translations work with symbols.

actionpack/lib/action_view/helpers/translation_helper.rb

@@ -14,13 +14,14 @@ def translate(keys, options = {})
         if keys.is_a?(Array)
           ActiveSupport::Deprecation.warn "Giving an array to translate is deprecated, please give a symbol or a string instead", caller
         end
-        options[:raise]  = true
-        are_keys_a_string  = keys.is_a?(String)
+
+        options[:raise] = true
+        return_first = keys.is_a?(String) || keys.is_a?(Symbol)
         keys = scope_keys_by_partial(keys)
 
         translations = I18n.translate(keys, options)
         translations = html_safe_translation_keys(keys, Array.wrap(translations))
-        are_keys_a_string ? translations.first : translations
+        return_first ? translations.first : translations
       rescue I18n::MissingTranslationData => e
         keys = I18n.send(:normalize_translation_keys, e.locale, e.key, e.options[:scope])
         content_tag('span', keys.join(', '), :class => 'translation_missing')
@@ -37,8 +38,10 @@ def localize(*args)
       private
         def scope_keys_by_partial(keys)
           Array.wrap(keys).map do |key|
-            if key.to_s.first == "."
-              template.path_without_format_and_extension.gsub(%r{/_?}, ".") + key.to_s
+            key = key.to_s
+
+            if key.first == "."
+              template.path_without_format_and_extension.gsub(%r{/_?}, ".") + key
             else
               key
             end

actionpack/test/template/translation_helper_test.rb

@@ -9,7 +9,7 @@ def setup
   end
 
   def test_delegates_to_i18n_setting_the_raise_option
-    I18n.expects(:translate).with([:foo], :locale => 'en', :raise => true).returns([""])
+    I18n.expects(:translate).with(['foo'], :locale => 'en', :raise => true).returns([""])
     translate :foo, :locale => 'en'
   end
 
@@ -55,6 +55,12 @@ def test_scoping_by_partial_of_an_array
     end
   end
 
+  def test_translate_works_with_symbols
+    I18n.expects(:translate).with(["hello"], :raise => true).returns(["Hello World"])
+    assert_equal "Hello World", translate(:hello)
+  end
+
+
   def test_translate_does_not_mark_plain_text_as_safe_html
     I18n.expects(:translate).with(["hello"], :raise => true).returns(["Hello World"])
     assert_equal false, translate("hello").html_safe?