I don`t understand this from rails 4: <td colspan="12" id="compatibility_activities-add" > <%= job.link_to_add t(‘shared.add’), :activities,:class => "right small button radius success", :data => { :target => "#activities#{job.object.person_type}_#{job.index}" } %> </td> where does the "link_to_add" comes from? there is no references inside the project and cant find anything on the net, there is another "link_to_remove" this… Read More Simple nested form for field