Re: Any way to force Django to commit a write so another process can read the correct data from DB?

Hi Mike,

It is not a bug.

It is just how it works.

Regards

On Thu, Jul 28, 2016 at 3:53 AM, Mike Dewhirst <miked@dewhirst.com.au> wrote:

On 28/07/2016 5:46 AM, Constantine Covtushenko wrote:

Hi Stodge,

As said in Django current version of documentation
<https://docs.djangoproject.com/en/1.9/ref/signals/#post-delete>,
'post_delete' signal is sent after record is deleted. This means also
that transaction is closed at that moment. And DB should not has deleted
instance any more.

I have double checked the Django code and can say that Django send that
signal just before transaction is committed.

Is this a Django bug?

Is it the same for post_save?

Mike

So technically instance should be inside DB for Hibernate processing.

I can suggest you to create a custom signal and send it after
transaction closed.
That should solve your problem.

Regards,

On Wed, Jul 27, 2016 at 5:27 PM, Stodge <stodge@gmail.com
<mailto:stodge@gmail.com>> wrote:

    My website uses a combination of Django + Java apps to function. For
    this particular problem, a record is deleted from the DB via a
    TastyPie resource DELETE operation. A Django signal post_delete
    handleris invoked, which submits a DELETE request to Jetty running
    in the Java app. The Java app then performs a query using Hibernate.

    What appears to be happening is that Django thinks the record was
    deleted:

    DynamicVolume.objects.filter(user=instance.user).count()

    Returns ZERO.

    However, the Java app thinks the record still exists unless I make
    it sleep for several seconds before asking Hibernate to query the DB.

    I've tried forcing Hibernate to clear its cache with no success. Is
    there a way to force Django to commit the deletion (flush the cache)?

    Thanks

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