Python and Django

29 Apr, 14

Run Multiple Django Apps With Celery On One Server With Rabbitmq VHosts

Very often we can have multiple Django apps each running celery and all this is installed on a single server. How do we isolate these separate app's celery workers? The answer is: Simple, if you use Rabbitmq as your broker. Rabbitmq lets us to add multiple virtualhosts, so we can ...

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25 Apr, 14

ERROR: must be owner of extension plpgsql

Today while moving Django/PostgreSQL site between servers and importing an SQL dump into the new location I got a surprising error "ERROR: must be owner of extension plpgsql". I'm already used to PostgreSQL quirks so after a quick search I came to the following solution: Login as postgres user ...

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23 Mar, 14

Sorting on chardfields in Haystack and Elasticsearch

Current version on Haystack (2.10) combined with Elasticsearch produces weird results when you want to sort search results on charfield, the issue has been reported here https://github.com/toastdriven/django-haystack/issues/866 and here: https://github.com/toastdriven/django-haystack/issues/569 Long story short, to fix the problem ...

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23 Mar, 14

Pass request object to the form: CBV and Form Mixins

If you want to access data from request object in your model form these two mixins will help you to do it easily: 1) You'll need a View mixin like this:

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  1. class RequestFormKwargsMixin(object):
  2. """
  3. CBV mixin which puts ...
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06 Mar, 14

Haystack Search Pager

To make haystack search pager place nicelly with other get parameters, we can do something like this: 1) Create a templatetag:

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  1. @register.simple_tag
  2. def get_search_pager_link(request):
  3. params = []
  4. link = '?'
  5. for key, value in request.GET.items():
  6. if key ...
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28 Feb, 14

Django Messages and Bootstrap 3

To make Django messages look nice in your bootstrap 3 template you need two things:

1. Create a custom template tag to define css name for a message:

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  1. @register.assignment_tag
  2. def get_bootstrap_alert_msg_css_name(tags):
  3. return 'danger' if tags == 'error' else tags

2. Add this snippet to your base ...

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12 Feb, 14

Start Django Project With Two Scoops of Django Template

Run this line in order to start Django project by using Two Scoops of Django Project Template:

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  1. django-admin.py startproject --template=https://github.com/twoscoops/django-twoscoops-project/zipball/master --extension=py,rst,html PROJECT_NAME
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12 Feb, 14

Serve static and media files by Django while in Debug mode

Media and static files won't be served in devel mode untill you put this at the end of the main urls.py file:

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  1. if settings.DEBUG:
  2. urlpatterns += patterns('',
  3. (r'^media/(?P.*)$', 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT}),
  4. (r'^static/(?P.*)$', 'django ...
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11 Feb, 14

Russian Slugs for Django Taggit

It appears that Django Taggit doesn't support transliteratable tags, what we need to do is to add such support, how you may ask? We should use proxy models. Just add this piece of code to, let's say, ru_taggit.py file:

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06 Feb, 14

Sorl-Thumbnail returns error: "SuspiciousOperation: Attempted access to '/media/products/505.jpg' denied"

When Solr Thumbnail (https://github.com/mariocesar/sorl-thumbnail) returns and error like "SuspiciousOperation: Attempted access to '/media/products/505.jpg' denied" or Bad request: 400 you need to check the path of the image you want to resize: it shouldn't start with your MEDIA_ROOT like  '/media/products/505 ...

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