uot;, echo=True)
>> Base.metadata.drop_all(e)
>> Base.metadata.create_all(e)
>>
>> s = Session(e)
>>
>> c1 = Chain()
>> m1 = Molecule(chain=c1)
>> r1 = RelatedToChain()
>> c1.related.append(r1)
>>
>> s.add_all([c1, m1, r1])
>&g
)
> r1 = RelatedToChain()
> c1.related.append(r1)
>
> s.add_all([c1, m1, r1])
> s.commit()
>
>
> s.delete(c1)
> s.commit()
>
>
>
>
>
>
>
>
>
>
>
>
> It works as expected with deleting the molecule, and test_molecule_chain
> rows are remo
to
> any test_molecules anymore. Am I doing something differently in my
> test_molecule configuration that I’m just not seeing?
>
> Mark Aquino
>
> *From:* sqlalchemy@googlegroups.com on behalf
> of Mike Bayer
> *Sent:* Wednesday, April 14, 2021 11:21:28 AM
> *T
of
Mike Bayer
Sent: Wednesday, April 14, 2021 11:21:28 AM
To: noreply-spamdigest via sqlalchemy
Subject: Re: [sqlalchemy] Issue with "complex" many 2 many delete, FK violation
hey there-
The general strategy, if you want to write business logic that checks things,
takes other actions,
hey there-
The general strategy, if you want to write business logic that checks things,
takes other actions, etc. when changes occur in the session, is to use the
before_flush event handler:
Hi Mike,
Sorry about the indentations.
I'm not sure I understand the changes you made to the script after delete
as it removes all test_chains, test_var_regions, and test_const regions
that are still referenced by the other test_molecules. The only way I've
been able to get the delete to work
Hi there -
I would ask that you try to make sure your formatting is maintained when
posting examples especially such long ones as I had to re-indent it in order to
run this.
The delete at the end is failing because of incomplete cascade rules. The
DELETE against "test_mol_sequence" seeks to
I just wanted to clarify, the desire would be for the "test_var_region" and
"test_const_region" entities that are linked to other entities to remain
untouched and only to have their associations removed from the deleted
items. The output from the ORM indicates that the system is actually
I need to delete the association table rows for many to many relationships
when I delete one, but the default behavior (to remove those rows) does not
seem to work in my case.
I have multiple levels of many to many relationships, as you can see in the
example I'll provide below and when I
