Thanks Jonathan, that should help me move forward.
On Tuesday, July 5, 2022 at 12:51:52 PM UTC-4 Jonathan Vanasco wrote:
>
> > I'm guessing we shouldn't be passing ORM objects to threads, but rather
> just passing IDs and then querying the full object in the thread function
>
> Correct.
>
> Database Connections and Sessions are not threadsafe, they are
> thread-local. See
> https://docs.sqlalchemy.org/en/14/orm/session_basics.html#is-the-session-thread-safe
>
> Consequently, all objects are thread-local.
>
> If you are simply dealing with read-only concepts, you can `.expunge` an
> object from one session/thread and `.merge` it into another
> session/thread. This is often playing with fire though, as you must be
> prepared to handle situations where the data may have changed as that type
> of work is not transaction-safe. See:
> https://docs.sqlalchemy.org/en/14/orm/session_state_management.html
>
>
>
> On Thursday, June 30, 2022 at 4:02:23 PM UTC-4 ben.c...@level12.io wrote:
>
>> Hi,
>>
>> I'm troubleshooting some code that uses thread_pool_executor to run a
>> function, passing an ORM entity as an argument. Within the executed
>> function, we are sometimes receiving a "Value Error: generator already
>> executing" when accessing a related entity via a relationship property.
>>
>> I'm guessing we shouldn't be passing ORM objects to threads, but rather
>> just passing IDs and then querying the full object in the thread function.
>> Does that hunch sound correct?
>>
>
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