code: def locate(self, store=current_store):
          
          if not isinstance(store, Store):
              raise TypeError('store must be an instance of '
                              'sqlalchemy_imageattach.store.Store, not ' +
                              repr(store))
          return store.locate(self)
docs: Gets the URL of the image from the ``store``.
  
          :param store: the storage which contains the image.
                        :data:`~sqlalchemy_imageattach.context.current_store`
                        by default
          :type store: :class:`~sqlalchemy_imageattach.store.Store`
          :returns: the url of the image
          :rtype: :class:`str`