Hi -
Your test case is omitting a critical detail which we would assume is you are
using the "implicit_returning=False" flag on your create_engine(). dont use
this flag as it serves no useful purpose and that will fix your issue here, we
will be deprecating and removing this flag.
will try to fix the immediate issue if possible.
On Tue, Aug 31, 2021, at 3:29 AM, Francesca L wrote:
> Hi group,
>
> I am tring to migrate from version *1.3.24* to *1.4.23* of SqlAlchemy, using
> *PostgreSQL 10*.
>
> I found that the following code example works with 1.3, but triggers a
> traceback with 1.4.
>
> import sqlalchemy
>
> session = ...
> metadata = sqlalchemy.MetaData()
> s_items = sqlalchemy.Sequence('s_items', start=1, increment=1,
> metadata=metadata)
> t_items = sqlalchemy.Table('t_items', metadata,
> sqlalchemy.Column('id', sqlalchemy.Integer, s_items, primary_key = True),
> )
> metadata.drop_all(bind=session.bind)
> metadata.create_all(bind=session.bind)
>
> class Item(object):
> pass
>
> sqlalchemy.orm.mapper(Item, t_items)
>
> item1 = Item()
> item2 = Item()
> session.add_all([item1, item2])
> session.flush()
>
> This code, with 1.4 only, triggers the following traceback:
>
> Traceback (most recent call last):
> File "C:\Python36\lib\site-packages\sqlalchemy\engine\base.py", line 1672,
> in _execute_context
> dialect, self, conn, execution_options, *args, **kw
> File "C:\Python36\lib\site-packages\sqlalchemy\engine\default.py", line
> 999, in _init_compiled
> self._process_executemany_defaults()
> File "C:\Python36\lib\site-packages\sqlalchemy\engine\default.py", line
> 1838, in _process_executemany_defaults
> if c.default and c.default.is_scalar:
> AttributeError: 'Sequence' object has no attribute 'is_scalar'
>
> The only way I found to work around this with version 1.4, is to call *flush
> *after each single *add*:
>
> item1 = Item()
> session.add(item1)
> session.flush()
> item2 = Item()
> session.add(item2)
> session.flush()
>
> But this seems weird, to me.
> Am I doing anything wrong?
> Thank you very much for any suggestion.
>
> Francesca Leon
>
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
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SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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