index.html.erb

<table class="table table-striped">
  <thead>
    <tr>
      <th>Start time</th>
      <th>Patient</th>
      <th>Description</th>
      <th></th>
    </tr>
  </thead>
  <% @appointments.each do |t| %>
    <tr>
      <th><%= t.datetime %> </th>
      <th><%= link_to t.patient, patient_path(t.patient_id) %> </th>
      <th><%= t.description %> </th>
      <th><%= link_to 'Edit', edit_appointment_path(t) %> </th>
      <th><%= link_to 'Destroy', patient_path(t),
             method: :delete,
             data: { confirm: 'Are you sure?' } %> </th>
    </tr>
  <% end %>
</table>
<p><%= link_to 'New Appointment', new_appointment_path %></p>