BS3: devise & flash messaging.

app/helpers/devise_helper.rb

@@ -1,21 +1,18 @@
 module DeviseHelper
-  # A simple way to show error messages for the current devise resource. If you need
-  # to customize this method, you can either overwrite it in your application helpers or
-  # copy the views to your application.
-  #
-  # This method is intended to stay simple and it is unlikely that we are going to change
-  # it to add more behavior or options.
   def devise_error_messages!
-    return "" if resource.errors.empty?
+    return '' if resource.errors.empty?
 
-    messages = resource.errors.full_messages.map { |msg| content_tag(:p, msg, :class => "alert") }.join
+    messages = resource.errors.full_messages.map { |msg| content_tag(:li, msg) }
     sentence = I18n.t("errors.messages.not_saved",
                       :count => resource.errors.count,
                       :resource => resource.class.model_name.human.downcase)
 
     html = <<-HTML
-    <p>#{sentence}</p>
-    #{messages}
+    <div class="alert alert-danger">#{sentence}
+    <ul>
+    #{messages.join}
+    </ul>
+    </div>
     HTML
 
     html.html_safe