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

[Mike Dewhirst]

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

Hi Stodge,

As said in Django current version of documentation
,
'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 > 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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Re: Any way to force Django to commit a write so another process can read the correct data from DB?

[Luis Zárate]

I thing java apps have a cache and it is java who is not looking in the
database.  I was a similar problem with hirbernate time ago. But I never
solved other person solved it and I don't know how.

El miércoles, 27 de julio de 2016, Constantine Covtushenko <
constantine.covtushe...@gmail.com> escribió:
> Hi Stodge,
> As said in Django current version of documentation, '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.
> 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  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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Groups "Django users" group.
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>> For more options, visit https://groups.google.com/d/optout.
>
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>

-- 
"La utopía sirve para caminar" Fernando Birri

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

[Constantine Covtushenko]

Hi Stodge,

As said in Django current version of documentation
,
'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.
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  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
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to django-users+unsubscr...@googlegroups.com.
> To post to this group, send email to django-users@googlegroups.com.
> Visit this group at https://groups.google.com/group/django-users.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/django-users/e76d5cfa-f4bc-41db-a322-0d44aa0719dd%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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

[Stodge]

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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Re: How do I do a multiple select in the Admin filters ?

[Hurlu]

Woo , finally did it !

For those coming after me , here is how I did :
Your 
struggle probably comes from the self.value() never being a list , right ? 
Well then, if you override the template filter.html to add a "multiple" to 
the , then , in your redefinition of the queryset() function, do a 
self.value = request.GET.getlist("[Insert parameter_name from your 
filter]"), then you'll get the list you clicked back in the Django admin !
 (The problem being that django uses request.GET.items() to retrieve the 
self.value(). Alas, as stated in this documentation, 

 
this method only gets the last item of the QueryDict object, unlike 
getlist() !

There is still one little problem to fix, being that , when loading the new 
page, the filter is being "resetted", containing only the last item of the 
QueryDict. I believe that's nothing that an handy JS /JQuery script can't 
handle though, so I may edit this comment adding the script when I manage 
to get it to work. 

Cheers! 

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Re: Installation

[Sergiy Khohlov]

Take a look at
https://jeffknupp.com/blog/2012/02/09/starting-a-django-project-the-right-way/
this is perfect doc related to your situation s.

27 лип. 2016 12:04 "Its Eternity"  пише:

Hey, a friend recently wrote my a web-app for me to use however I am not
sure how I deploy the web app onto my VPS. I've looked at the tutorials on
Django but it says that  I can only use it for development. Is there a
method for me to get Django for public use?

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Re: Installation

[Julien Castets]

On Wed, Jul 27, 2016 at 10:16 AM, Its Eternity  wrote:
> Hey, a friend recently wrote my a web-app for me to use however I am not
> sure how I deploy the web app onto my VPS. I've looked at the tutorials on
> Django but it says that  I can only use it for development. Is there a

Hi,

I created a Python image a while ago for Scaleway, a cloud computing
provider (https://www.scaleway.com/). To host a Django application on
Scaleway using this image, you need to:
* create an account
* start a new server, click on "choose image", use the "imagehub" tab
and select the "Python" image
* start the server and ssh into it

The /root/README.txt file explains how to create a Django application:

$> pip install django
$> cd /var/www
$> django-admin startproject my_django_project
$> ln -s /etc/nginx/sites-available/my_website /etc/nginx/sites-enabled/
$> ln -s /etc/uwsgi/apps-available/my_django_project.ini
/etc/uwsgi/apps-enabled/
$> service uwsgi restart
$> service nginx restart

More details on the image's github:
https://github.com/scaleway-community/scaleway-python/tree/master/overlay

Disclaimer: I work at Scaleway

Regards,
-- 
Julien Castets
+33 (0)6.85.20.10.03

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Installation

[Its Eternity]

Hey, a friend recently wrote my a web-app for me to use however I am not 
sure how I deploy the web app onto my VPS. I've looked at the tutorials on 
Django but it says that  I can only use it for development. Is there a 
method for me to get Django for public use?

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Re: Best way to keep the current selection

[Javier Guerra Giraldez]

On 27 July 2016 at 02:02, Lee Hinde  wrote:
> To maintain state, after any ad-hoc query, I store the ids for the found 
> records:
>
> self.request.session['query.classes.last_ids'] = 
> list(queryset.values_list('id', flat=True))

add a new model: Previous_Searchs or something like this, with
metadata on the search (user, date, sort critera, etc) and a many2many
link to the found records.

it makes it easy to repeat a search, keep it for longer, name it, or
even share it


-- 
Javier

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