User Categories

When creating a new notebook, a group can be assigned. When creating a
new account a group can be assigned. Only your groups notebooks will
show up.

Add below to new.html.erd under devise:

<table class="table">
<tr>
<th>Subject</th>
</tr>
<tr>
<td>Computing</td>
<td><%=  f.radio_button :subject_id, '1' %></td>
</tr>
<tr>
<td>Animal Care</td>
<td><%=  f.radio_button :subject_id, '2' %></td>
</tr>
</table>