First working version with devise+rails_admin

app/views/layouts/application.html.erb

@@ -10,6 +10,14 @@
   </head>
 
   <body>
+  <% unless flash.empty? %>
+    <script type="text/javascript">
+        <% flash.each do |f| %>
+        <% type = f[0].to_s.gsub('alert', 'error').gsub('notice', 'info') %>
+        toastr['<%= type %>']('<%= f[1] %>');
+        <% end %>
+    </script>
+  <% end %>
     <p class="notice"><%= notice %></p>
     <p class="alert"><%= alert %></p>
     <%= yield %>