fixes default attributes for button_tag

actionview/lib/action_view/helpers/form_tag_helper.rb

@@ -469,13 +469,13 @@ def submit_tag(value = "Save changes", options = {})
       #   # => <button data-disable-with="Please wait..." name="button" type="submit">Checkout</button>
       #
       def button_tag(content_or_options = nil, options = nil, &block)
-        options = content_or_options if block_given? && content_or_options.is_a?(Hash)
-        options ||= {}
-        options = options.stringify_keys
-
-        options.reverse_merge! 'name' => 'button', 'type' => 'submit'
-
-        content_tag :button, content_or_options || 'Button', options, &block
+        if block_given? && content_or_options.is_a?(Hash)
+          options = button_tag_options_with_defaults(content_or_options)
+          content_tag :button, options, &block
+        else
+          options = button_tag_options_with_defaults(options)
+          content_tag :button, content_or_options || 'Button', options
+        end
       end
 
       # Displays an image which when clicked will submit the form.
@@ -741,6 +741,12 @@ def form_tag_in_block(html_options, &block)
         def sanitize_to_id(name)
           name.to_s.delete(']').gsub(/[^-a-zA-Z0-9:.]/, "_")
         end
+
+        def button_tag_options_with_defaults(options = {})
+          default_options = { 'name' => 'button', 'type' => 'submit' }
+          options.stringify_keys!
+          options.reverse_merge! default_options
+        end
     end
   end
 end

actionview/test/template/form_tag_helper_test.rb

@@ -476,6 +476,11 @@ def test_button_tag_with_block_and_options
     assert_dom_equal('<button name="temptation" type="button"><strong>Do not press me</strong></button>', output)
   end
 
+  def test_button_tag_defaults_with_block_and_options
+    output = button_tag(:name => 'temptation', :value => 'within') { content_tag(:strong, 'Do not press me') }
+    assert_dom_equal('<button name="temptation" value="within" type="submit" ><strong>Do not press me</strong></button>', output)
+  end
+
   def test_button_tag_with_confirmation
     assert_dom_equal(
       %(<button name="button" type="submit" data-confirm="Are you sure?">Save</button>),