docs: def show(self, id):
          """GET /layertemplates/id: Show a specific item."""
          # url('LayerTemplates', id=ID)
          lt = meta.Session.query(LayerTemplate).get(id)
          # use following query for getting a layertemplate owned by current user
          #lt = self._get_lt_from_user_by_id(c.user, id)
          if lt is None:
              abort(404)
          return lt.to_json()