[fix #474] display devise errors with flashes

app/helpers/application_helper.rb

@@ -0,0 +1,8 @@
+module ApplicationHelper
+  def flash_class(level)
+    case level
+    when "notice" then "alert-success"
+    when "alert" then "alert-danger"
+    end
+  end
+end

app/helpers/devise_helper.rb

@@ -0,0 +1,8 @@
+module DeviseHelper
+  def devise_error_messages!
+    if resource.errors.full_messages.any?
+      flash.now[:alert] = resource.errors.full_messages
+    end
+    ''
+  end
+end

app/views/layouts/_flash_messages.html.haml

@@ -1,8 +1,11 @@
-- if flash.notice.present? || flash.alert.present?
+- if flash.any?
   #flash_message.center
-    - if flash.notice.present?
-      .alert.alert-success
-        = flash.notice
-    - if flash.alert.present?
-      .alert.alert-danger
-        = flash.alert.html_safe
+    - flash.each do |key, value|
+      - if value.class == Array
+        .alert{ class: flash_class(key) }
+          - value.each do |message|
+            = message
+            %br
+      - else
+        .alert{ class: flash_class(key) }
+          = value