app/assets/stylesheets/admin.scss

@@ -10,6 +10,8 @@ body#admin-panel {
 
   #main-nav {
     ul {
+      grid-template-columns: repeat(4, 1fr);
+
       li {
         a {
           &.active {

app/assets/stylesheets/layout.scss

@@ -119,12 +119,7 @@ main {
   }
 
   section {
-    padding-bottom: 3rem;
     margin-bottom: 3rem;
-
-    &:not(:last-of-type) {
-      border-bottom: 1px dotted #ccc;
-    }
   }
 
   table {

app/controllers/admin/invitations_controller.rb

@@ -0,0 +1,8 @@
+class Admin::InvitationsController < Admin::BaseController
+  def index
+    @current_section = :invitations
+    @invitations_unused_count = Invitation.unused.count
+    @users_with_referrals_count = Invitation.used.distinct.count(:user_id)
+    @invitations_used = Invitation.used.order('used_at desc')
+  end
+end

app/views/admin/invitations/index.html.erb

@@ -0,0 +1,32 @@
+<section>
+  <h2>Invitations</h2>
+  <p>
+    There are currently <strong><%= @invitations_unused_count %>
+    unused invitations</strong> available to existing users.
+    <strong><%= @users_with_referrals_count %> users</strong> have successfully
+    invited new users.
+  </p>
+</section>
+<% if @invitations_used.any? %>
+  <section>
+    <h3>Accepted (<%= @invitations_used.length %>)</h3>
+    <table>
+      <thead>
+        <tr>
+          <th>Token</th>
+          <th>Accepted</th>
+          <th>Invited user</th>
+        </tr>
+      </thead>
+      <tbody>
+        <% @invitations_used.each do |invitation| %>
+          <tr>
+            <td class="overflow-ellipsis"><%= invitation.token %></td>
+            <td><%= invitation.used_at.strftime("%Y-%m-%d") %></td>
+            <td><%= User.find(invitation.invited_user_id).address %></td>
+          </tr>
+        <% end %>
+      </tbody>
+    </table>
+  </section>
+<% end %>

app/views/shared/_admin_nav.html.erb

@@ -5,6 +5,10 @@
         <%= link_to "Dashboard", admin_root_path,
              class: @current_section == :dashboard ? "active" : nil %>
       </li>
+      <li>
+        <%= link_to "Invitations", admin_invitations_path,
+              class: @current_section == :invitations ? "active" : nil %>
+      </li>
       <li>
         <%= link_to "Donations", admin_donations_path,
               class: @current_section == :donations ? "active" : nil %>

config/routes.rb

@@ -18,6 +18,7 @@ Rails.application.routes.draw do
 
   namespace :admin do
     root to: 'dashboard#index'
+    get 'invitations', to: 'invitations#index'
     get 'ldap_users', to: 'ldap_users#index'
     resources :donations
   end