app/views/admin/users/_school_group_picker.html.erb
<h2>School group users</h2>
<div id="top" class="d-flex justify-content-between align-items-center">
<form action="" class="form">
<label for="admin-user-picker">Choose group</label>
<select id="admin-user-picker" class="admin-user-picker">
<% @school_groups.each do |school_group| %>
<option value="/admin/school_groups/<%= school_group.name.parameterize %>/users"><%= school_group.name %></option>
<% end %>
<option value="#school_group_users">School group users</option>
<option value="#no_school_users">Users without a school</option>
</select>
</form>
</div>