app/views/departments/index.html.erb
<table class="table table-bordered">
<thead>
<tr>
<td>
Name
</td>
<td>
Number of employees
</td>
<td>
Actions
</td>
</tr>
</thead>
<% @departments.each do | department| %>
<tr>
<td>
<%= link_to department.name ,department_path(department) %>
</td>
<td>
<%= department.employees.count %>
</td>
<td>
</td>
</tr>
<% end %>
</table>