Added dropdown menu to logged in users

app/assets/javascripts/application.js

@@ -12,5 +12,6 @@
 //
 //= require jquery
 //= require jquery_ujs
+//= require bootstrap
 //= require turbolinks
 //= require_tree .

app/controllers/sessions_controller.rb

@@ -1,4 +1,5 @@
 class SessionsController < ApplicationController
+
   def new
   end
 

app/helpers/sessions_helper.rb

@@ -8,4 +8,9 @@ def log_in(user)
   def current_user
     @current_user ||= User.find_by(id: session[:user_id])
   end
+
+  # Returns true if the user is logged in, false otherwise.
+  def logged_in?
+    !current_user.nil?
+  end
 end

app/views/layouts/_header.html.erb

@@ -3,9 +3,26 @@
     <%= link_to "sample app", root_path, id: "logo" %>
     <nav>
       <ul class="nav navbar-nav pull-right">
-        <li><%= link_to "Home",   root_path %></li>
-        <li><%= link_to "Help",   help_path %></li>
-        <li><%= link_to "Log in", '#' %></li>
+        <li><%= link_to "Home", root_path %></li>
+        <li><%= link_to "Help", help_path %></li>
+        <% if logged_in? %>
+          <li><%= link_to "Users", '#' %></li>
+          <li class="dropdown">
+            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
+              Account <b class="caret"></b>
+            </a>
+            <ul class="dropdown-menu">
+              <li><%= link_to "Profile", current_user %></li>
+              <li><%= link_to "Settings", '#' %></li>
+              <li class="divider"></li>
+              <li>
+                <%= link_to "Log out", logout_path, method: "delete" %>
+              </li>
+            </ul>
+          </li>
+        <% else %>
+          <li><%= link_to "Log in", login_path %></li>
+        <% end %>
       </ul>
     </nav>
   </div>