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All snippets written in Python

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Circular reference with Django ORM and Postgres without breaking NOT NULL FK constraints

The recipe uses deferred constraint validation to create circular references across database tables. The example requires Postgres (MySQL doesn't support deferred constraints). To achieve this, the following is required: * Insertions must be performed in a transaction. Foreign key constraints will be validated at the end of the transactions, allowing for insertion of rows with FKs pointing to rows that don't exist yet. * Primary keys need to be generated before insertion. That's what `prefetch_id` does by pulling the next value from the `*_id_seq` sequence.

  • django
  • orm
  • postgres
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Allow multiple field sorting in a single admin table column

This snippets extends ModelAdmin in order to allow multi field sorting in admin tables. Usage example: class MyModelAdmin(MultiFieldSortableModelAdmin): list_display = ( ... 'user_full_name', ... ) def user_full_name(self, obj): return obj.user.get_full_name() user_full_name.admin_order_field = ['user__first_name', 'user__last_name']`

  • ModelAdmin
  • admin_order_field
  • multifiled sorting
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LocaleMiddleware without browser language discovery

This snippet holds your Django project from automatically changing language of the page to the best fitting one by discovering the client browser language. I personally needed to show the page to the user for the first time in the default language (English), although there were some translations. User can still change the language (via session cookies). Insert this middleware BEFORE the Django's `django.middleware.locale.LocaleMiddleware` in settings.

  • middleware
  • i18n
  • locale
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Seeded Randomized Querysets w/ Pagination Mixin

Mixin to support pagination when randomizing querysets. Requirements: Postgres, Django Sessions Note: This shouldn't be used on large complex datasets. It utilizes the relatively slow method of '?' randomized sorting. Use with caution. Todo: MySQL support, Support for larger datasets

  • django
  • session
  • pagination
  • random
  • postgres
  • mixin
  • postgresql
  • cbv
  • seeded
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Load dynamically loaded form javascript assets using dajax

I am used to load forms directly into modals using dajax but I found out I had to load the scripts using an ajax call from the browser. You can see here an example of a dynamically loaded form and the function used to load the scripts.

  • ajax
  • javascript
  • forms
  • script
  • dynamically-loaded-form
  • form-assets
  • dajax
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Decorator @not_login_required

This is a simple django snippet! It is the *opposite of @login_required* decorator for Django views Example **@not_login_required** ``` def login_page(request): ... ```

  • decorator
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get_querystring template tag

A Django Template tag used to construct urls with current querystring parameters. This is based on some code that I've written some years ago. Enjoy.

  • template
  • templatetag
  • querystring
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django-constance generic view

For several projects I am using generic views instead of django-admin, I needed a generic view for constance instead of using their django-admin based app.

  • django-constance
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