app/views/protocol_relationships/_form.html.erb
<%= form_for(@protocol_relationship) do |f| %>
<%= render 'shared/errors', object: @protocol_relationship %>
<div class="required">
<div class="field">
<%= f.label :protocol_id %>
<br>
<%= render partial: 'workbench/elements/forms/ajax_select',
locals: {controller: 'protocols',
object: 'protocol_relationship',
method: 'protocol_id',
tag_id: 'protocol_id_for_protocol_relationship',
display: protocol_autocomplete_selected_tag(@protocol_relationship.protocol),
size: 20} %>
</div>
</div>
<%= f.hidden_field :protocol_relationship_object_type %>
<%= f.hidden_field :protocol_relationship_object_id %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>