Add Success/Error Messages

routes/user_sessions.rb

@@ -4,12 +4,16 @@ class Yogurt
       r.post do
         env['warden'].authenticate!
 
+        flash[:success] = "You are logged in"
+
         r.redirect session[:return_to] || '/communities'
       end
 
       r.delete do
         env['warden'].logout
 
+        flash[:success] = "You are logged out"
+
         r.redirect '/user_sessions/new'
       end
     end
@@ -22,6 +26,8 @@ class Yogurt
       session[:return_to] = env['warden.options'][:attempted_path]
       response.status = 403
 
+      flash[:danger] = "Could not authenticate"
+
       render '/user_sessions/new'
     end
   end

views/layout.html.erb

@@ -42,6 +42,12 @@
         <h3 class="text-muted">Project name</h3>
       </div>
 
+      <% flash.each do |kind, message| %>
+        <div class='alert alert-<%= kind %>' role='alert'>
+          <p> <%= message %> </p>
+        </div>
+      <% end %>
+
       <%= yield %>
 
       <footer class="footer">

views/user_sessions/new.html.erb

@@ -25,6 +25,13 @@
     <div class="container">
       <form class="form-signin" action='/user_sessions' method='POST'>
         <h2 class="form-signin-heading">Please sign in</h2>
+
+        <% flash.each do |kind, message| %>
+          <div class='alert alert-<%= kind %>' role='alert'>
+            <p> <%= message %> </p>
+          </div>
+        <% end %>
+
         <label for="email" class="sr-only">Email address</label>
         <input type="email" name='email' class="form-control" placeholder="Email address" required autofocus>
         <label for="password" class="sr-only">Password</label>

yogurt.rb

@@ -8,6 +8,7 @@ class Yogurt < Roda
   plugin :all_verbs
   plugin :symbol_views
   plugin :view_options
+  plugin :flash
   plugin :render, ext: 'html.erb', layout: '/layout'
   plugin :static, %w[/images /fonts]
   plugin :multi_route