app/views/citation_topics/_form.html.erb
<div class="field">
<%= ct.label :topic_id %>
<br>
<%= render partial: 'workbench/elements/forms/ajax_select',
locals: {controller: '/topics',
object: "citation[citation_topics_attributes][#{ct.index}]",
method: 'topic_id',
tag_id: "topic_id_for_citation_topics_attributes_#{ct.index}",
display: topic_tag(ct.object.topic)}
%>
</div>
<div class="field">
<%= ct.label :pages %>
<br>
<%= ct.text_field :pages %>
</div>