<div class="form-group">
  <%= form.label field.key %>
  <%=
    form.select field.association_foreign_key,
                options_from_collection_for_select(
                  field.association_collection,
                  :id,
                  field.association_display_value,
                  field.association_id_or_blank_for(resource)
                ),
                { include_blank: true },
                class: 'form-control'
  %>
</div>