25821a8a45a3_remove_unique_constraint_on_requests.py 文件源码

def downgrade():
    '''
    downgrade method
    '''
    if context.get_context().dialect.name != 'sqlite':
        # mysql has to remove FK constraint to drop IDX
        drop_constraint('REQUESTS_RSES_FK', 'requests', type_='foreignkey')
        drop_constraint('REQUESTS_DID_FK', 'requests', type_='foreignkey')
        drop_index('REQUESTS_SCOPE_NAME_RSE_IDX', 'requests')
        create_foreign_key('REQUESTS_RSES_FK', 'requests', 'rses', ['dest_rse_id'], ['id'])
        create_foreign_key('REQUESTS_DID_FK', 'requests', 'dids', ['scope', 'name'], ['scope', 'name'])
        create_unique_constraint('REQUESTS_SC_NA_RS_TY_UQ_IDX', 'requests', ['scope', 'name', 'dest_rse_id', 'request_type'])