ops.py 文件源码

def batch_create_unique_constraint(
            cls, operations, constraint_name, columns, **kw):
        """Issue a "create unique constraint" instruction using the
        current batch migration context.

        The batch form of this call omits the ``source`` and ``schema``
        arguments from the call.

        .. seealso::

            :meth:`.Operations.create_unique_constraint`

        .. versionchanged:: 0.8.0 The following positional argument names
           have been changed:

           * name -> constraint_name

        """
        kw['schema'] = operations.impl.schema
        op = cls(
            constraint_name, operations.impl.table_name, columns,
            **kw
        )
        return operations.invoke(op)