app/views/admin/geo_relationships/_form.html.erb
<%= form_for :geo_relationship, :url => collection_url, :remote => true do |f| %>
<%= error_messages_for(@geo_relationship) %>
<label>Geo entity</label>
<%= f.select :geo_entity_id,
options_from_collection_for_select(@geo_entities, :id, :name, @geo_relationship && @geo_relationship.geo_entity_id)
%>
<label>Relationship type</label>
<%= f.select :geo_relationship_type_id,
options_from_collection_for_select(@geo_relationship_types, :id, :name, @geo_relationship && @geo_relationship.geo_relationship_type_id)
%><br />
<label>Related geo entity</label>
<%= f.select :other_geo_entity_id,
options_from_collection_for_select(@geo_entities, :id, :name, @geo_relationship && @geo_relationship.other_geo_entity_id)
%>
<% end %>