Add flash messages

app/controllers/friendships_controller.rb

@@ -1,4 +1,5 @@
 class FriendshipsController < ApplicationController
+  before_action :require_login
   before_action :set_friendship, only: [:show, :destroy]
 
   def index

app/helpers/application_helper.rb

@@ -1,2 +1,16 @@
 module ApplicationHelper
+  def bootstrap_class_for(flash_type)
+    bootstrap_classes[flash_type] || flash_type.to_s
+  end
+
+  private
+
+  def bootstrap_classes
+    {
+      'alert'   => 'alert-warning',
+      'error'   => 'alert-danger',
+      'notice'  => 'alert-info',
+      'success' => 'alert-success'
+    }
+  end
 end

app/views/application/_flash_messages.html.erb

@@ -0,0 +1,9 @@
+<% flash.each do |type, message| %>
+  <div class="alert <%= bootstrap_class_for(type) %> fade in" %>
+    <button type="button" class="close" data-dismiss="alert">
+      <span aria-hidden="true">&times;</span>
+      <span class="sr-only">Close</span>
+    </button>
+    <%= message %>
+  </div>
+<% end %>

app/views/layouts/application.html.erb

@@ -35,6 +35,7 @@
 </div>
 
 <div class="container">
+  <%= render 'flash_messages', flash: flash %>
   <%= yield %>
 </div>