chexpire/app/views/shared/_navbar.html.erb

<nav class="navbar navbar-expand-lg navbar-light bg-light justify-content-between">
  <%= link_to "Chexpire", root_path , class: "navbar-brand" %>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <% if user_signed_in? %>
        <li class="nav-item">
          <%= link_to(t(".my_checks"), checks_path, class: "nav-link") %>
        </li>
        <li class="nav-item">
          <%= link_to(t(".new_domain_check"), new_check_path(kind: :domain), class: "nav-link") %>
        </li>
        <li class="nav-item">
          <%= link_to(t(".new_ssl_check"), new_check_path(kind: :ssl), class: "nav-link") %>
        </li>
      <% end %>
    </ul>

    <div class="my-2 my-lg-0">
      <% if user_signed_in? %>

        <div class="navbar-item">
          <div class="dropdown">
            <a class="nav-link dropdown-toggle" href="#"
              id="navbarDropdown" role="button" data-toggle="dropdown"
              aria-haspopup="true" aria-expanded="false">
              <%= current_user.email %>
            </a>
            <div class="dropdown-menu" aria-labelledby="navbarDropdown">
              <%= link_to edit_user_registration_path, class: "dropdown-item" do %>
                <i class="fa fa-user"></i> <%= t(".profile", default: "Profile") %>
              <% end %>

              <%= link_to destroy_user_session_path, method: :delete, class: "dropdown-item" do %>
                <i class="fa fa-sign-out"></i>  <%= t(".sign_out", default: "Log out") %>
              <% end %>
            </div>
          </div>
        </div>
      <% else %>
        <!-- Login link (when logged out) -->
        <%= link_to t(".sign_in"), new_user_session_path, class: "navbar-item navbar-link" %>
        <%= link_to t(".sign_up"), new_user_registration_path, class: "navbar-item navbar-link" %>
      <% end %>
    </div>
  </div>
</nav>