app/views/admin/taxon_commons/_form.html.erb
<%= form_for [:admin, @taxon_concept, @taxon_common], :remote => true do |f| %>
<%= error_messages_for(@taxon_common) %>
<%= f.text_field :name, :value => @taxon_common.common_name&.name %>
<%= f.select :language_id,
options_from_collection_for_select(@languages, :id, :name_en, @taxon_common.common_name&.language_id ),
{}, :class => 'select2'
%>
<% end %>