Django/Web Programming Pattern

[Timothy W. Cook]

Well, this isn't likely a Django specific question but since this
project is built in Django, I'd like to know how best to handle this
issue.

I have a view that calls a function and performs a long running
process. It reads and processes a file, creating potentially
thousands of objects and can take up to several minutes to complete.

Right now it just displays a pretty much blank template. This isn't
very user friendly. I imagine some kind of counter or progress bar
but I am not certain how best to display this via Django.

What do others do in this case?

Thanks,
Tim



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[Jonathan Baker]

This sounds like a good candidate for an async Celery task: http://docs.celeryproject.org/en/latest/index.html

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Jonathan D. Baker
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[Timothy W. Cook]

Thanks Jonathan. Looks interesting from the FAQ.
I'll give it a shot and see what happens.

> https://groups.google.com/d/msgid/django-users/CAPMFOb4M7BSndCdN3N0STgwiN%2BA%2BbAZ5f80OkqBtLB1xosfr7A%40mail.gmail.com.

> For more options, visit https://groups.google.com/groups/opt_out.



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[Larry Martell]

On Thu, Nov 14, 2013 at 9:37 AM, Timothy W. Cook <t...@mlhim.org> wrote:

Well, this isn't likely a Django specific question but since this
project is built in Django, I'd like to know how best to handle this
issue.

I have a view that calls a function and performs a long running
process.  It reads and processes a file, creating potentially
thousands of objects and can take up to several minutes to complete.

Right now it just displays a pretty much blank template.  This isn't
very user friendly.  I imagine some kind of counter or progress bar
but I am not certain how best to display this via Django.

What do others do in this case?

I have a situation where I'm loading a lot of images that takes a long time. What I do is I have this code in my template:

<span class='loadMsg' style='display: none; color:lightgray; text-align: left;'> ... loading images </span>

$('.loadMsg').show();

window.onload = function() {

    $(function() {

        $('.loadMsg').hide();

    });

};

Not the most elegant thing in the world, but it works and meets my needs. YMMV

[Jonathan Baker]

You're welcome. I just set celery+rabbitmq up on a new project, and while it can seem like a lot of steps (and potential information overload), it isn't so bad once you get a grasp on the concepts.

One thing that recently bit me: once in production with running workers, if the models your task code are interacting with change (in my case, a south migration from concrete inheritance to abstract), you need to restart the workers just like you would Apache (doc: http://docs.celeryproject.org/en/latest/userguide/workers.html#restarting-the-worker). This seems obvious to me know, but hindsight...

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[Amirouche Boubekki]

Celery might overkill they are other more simple solutions that only involve your current database and cron jobs.

Regards,


Amirouche

2013/11/14 Jonathan Baker <jonathand...@gmail.com>

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[Claudio Filho]

Óhoz