link.slim

form method='post' action=url(record)
  
  fieldset

    input name='_method' type='hidden' value='link'
    
    p
      input name='link[rel]' type='hidden' value=rel
      input name='link[id]' type='text' required=true
    
    p
      input type='submit' value='add'

unlink.slim

form method='post' action=url(record)

  fieldset

    input name='_method' type='hidden' value='unlink'

    input name='link[id]' type='hidden' value=id
    input name='link[rel]' type='hidden' value=rel
  
    p
      input type='submit' value='remove'