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All snippets written in Python

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Django admin autoregister

Official GitHub page: https://github.com/Mimino666/django-admin-autoregister One call to autoregister_admin() automatically creates and registers admin views for all the models in the specified module with intelligent linking between ForeignKey, OneToOneField and ManyToManyField fields.

  • models
  • admin
  • auto
  • autoregister
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Email backend to BCC all emails

The backend lets you quickly get an idea of all emails that are sent out. Helpful for debugging or keeping an archive of all communications. Use instead of Django's SMTPBackend.

  • email
  • backend
  • bcc
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Ultimate(?) export/download CSV admin action

This owes a debt to a number of earlier snippets by myself and others, including: *(most directly)* [#2868](http://djangosnippets.org/snippets/2868/), plus [#2020](http://djangosnippets.org/snippets/2020/), [#2712](http://djangosnippets.org/snippets/2712/), [#1697](http://djangosnippets.org/snippets/1697/) Use of OrderedDict means it requires Python 2.7+. You also need to `pip install singledispatch` which is a backport of a Python 3.4 feature. Singledispatch (along with custom attributes instead of a factory function) gives a very clean interface in your ModelAdmin, whether or not you need a custom `short_description`. This version allows you to (optionally) specify custom column labels, or to (optionally) use Django's usual prettifying mechanism (`field.verbose_name`). Thanks to #2868 it can do relation-spanning double-underscore lookups and also model attribute/method (rather than field) lookups for columns, just like you can in your ModelAdmin `list_display`.

  • csv
  • admin-actions
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Accessing URL variable from within a Form

**Use case:** Suppose you are working on maintenance screens on some data objects. On one particular page (a form) you want to have exits directly back to a calling page (as a cancel operation) or indirectly back to the calling page (after an data update operation). However, the form and its object are not directly related to the target page (perhaps a one-to-many relationship) so you cannot figure the calling page from object data - but the target object IS referenced in the url. ** How To:** To make this work, we need to pick out a variable from the URL of the current page and use it to generate the URL of the target page. 1. [urls.py] Models *Banker* and *Iaccount* are related as One-to-Many so if we are creating an *Iaccount* we cannot usually determine the *Banker* object to return to. In this example, URL1 contains the variable `iid` - the primary key to the Banker object; this will render a create form. We want to be able to reference URL2 from this form. 2. [views.py: get_initial] We can access the variable we want with `self.kwargs['iid']` and use it to set the initial value of the `ident` fields which links back to the *Banker* object 3. [views.py: get_success_url] In the same way we can pass the value into the form's *success_url* to point at URL2 4. [template] In the template, we can also access the variable now as `form.ident.value` so we can construct a *Go Back* link to URL2 Thanks to Thomas Orozco for leading the way.

  • url
  • form
  • cbv
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Logging to rotating files

It took me some time to figure out how to set up logging in Django. What I want to do is to log to a pair of rotating files each 1MB in size. What I come up with is this code segment in the `settings.py` file.

  • settings
  • logging
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Many 2 Many Admin Ordering with Mysql

My Models has a FK to translations and also a many 2 many to categories which also them are translated With this code I concatenate the translation of the categories and allow the changelist to order them. works only on mysql but you can adapt to your DB SET SESSION is required by mysql.

  • admin
  • mysql
  • m2m
  • ordering
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Save Geolocation for an Address based model on save()

This code will work on any model using correct address data in its fields that also require latitude and longitude data to be updated on saving. It uses pythons own default urllib and json, so no need to install 3rd party stuff to make it work. This method is preferred to getting it on the fly, due to the OVER_QUERY_LIMIT that you will get when parsing many address, this way means it stays up to day in the model and will update when any part of the address changes.

  • Geolocation
  • Geolocation on save
  • Google Geolocation
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A Lazy ModelChoiceField implementation

Sometimes we may need to generate a *ModelChoiceField* in which choices are generated at runtime, depending on the locale language. The snippet generates a *ChoiceField* based on a queryset and a specific attribute of the Model, ordering the choices by the attribute content in the locale language. **Usage example** (inside a form declaration) country = LazyModelChoiceField(sort_by='name', queryset = \ Country.objects.all, empty_label=_('All countries'), label=_('Country')) Based on lsbardel LazyChoiceField implementation (snippet 1767)

  • forms
  • model
  • field
  • ModelChoiceField
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