docs: def add_typeattr(typeattr,**kwargs):
      """
          Add an typeattr to an existing type.
      """
  
      tmpltype = get_templatetype(typeattr.type_id, user_id=kwargs.get('user_id'))
  
      ta = _set_typeattr(typeattr)
  
      tmpltype.typeattrs.append(ta)
  
      db.DBSession.flush()
  
      return ta