duplicate, please delete
please delete this, a snippet got posted twice accidentally
- djangosnippets
Snippet List
Initial values for new items in admin
Example: class NewsAdmin(InitialFieldsMixin, admin.ModelAdmin): initial = {'author_name': lambda self, request, obj, **kwargs: request.user}
- admin
truncatechars filter
Truncates a string after a certain number of chars. Question: > *Why don't you use the built-in filter slice?* I need the "three points" (...) only when it really truncates.
- template
- filter
- truncatewords
Save a model using an arbitrary db connection
This function lets you save an instance of a model to another database based on a connection argument. Useful when doing data migrations across databases. Connection is anything that would work as a django.db.connection I'm not sure if this handles proxy models or model inheritance properly, though.
- multi-db
- connection
Fix duplicate first page of paginated results
Search engines might conclude there's duplicate content if `/some_view/` and `/some_view/?page=1` returns the same results. This middleware redirects `?page=1` to the URL without the page parameter. You can set the name of the parameter in settings.py as `PAGE_VAR`. See [here](http://www.muhuk.com/2009/08/a-civilized-way-display-lots-of-data/) for more details.
- middleware
- pagination
- seo
- paginate
Template Filter: Add indentation
Template filter to add the given number of tabs to the beginning of each line. Useful for keeping markup pretty, plays well with Markdown. Usage: {{ content|indent:"2" }} {{ content|markdown|indent:"2" }}
- filter
- markup
- pretty
- indent
- indentation
Auto-rename duplicate fields
This is useful to run before you add a unique key to a character field that has duplicates in it. It just adds numbers to the end of the contents, so they will be unique. It takes a model class and a field name. The model class can be a South fake orm object, so this can be used inside data migrations.
- rename
- duplicate
- south
- unique-key
CharField powered Tags with ChoiceField widget.
Shell example: >>> pprint.pprint(settings.FORUM_TAGS) ((u'x11', 'Xorg'), (u'pacman', 'Pacman'), (u'aur', 'AUR'), (u'abs', 'ABS'), (u'howto', 'HOWTO'), (u'instalacja', 'Instalacja'), (u'offtopic', 'Offtopic')) >>> t = Thread.objects.all()[0] >>> pprint.pprint(t.tags) [{'slug': u'pacman', 'title': 'Pacman'}, {'slug': u'abs', 'title': 'ABS'}, {'slug': u'howto', 'title': 'HOWTO'}, {'slug': u'instalacja', 'title': 'Instalacja'}, {'slug': u'offtopic', 'title': 'Offtopic'}] >>> t.tags = [{'slug': 'abs'}, {'slug': 'howto'} >>> t.save() >>> t = Thread.objects.get(pk=t.pk) >>> pprint.pprint(t.tags) [{'slug': u'abs', 'title': 'ABS'}, {'slug': u'howto', 'title': 'HOWTO'}] >>> t.tags = ['Offtopic', 'HOWTO'] >>> t.save() >>> t = Thread.objects.get(pk=t.pk) >>> pprint.pprint(t.tags) [{'slug': u'howto', 'title': 'HOWTO'}, {'slug': u'offtopic', 'title': 'Offtopic'}]
- tag
- forms
- field
- selectmultiple
- checbox
Limit ManyToMany fields in forms
Limit ManyToMany fields in forms. Hide the field, if only one item can be selected. e.g. For limit sites choices only to accessible sites. Also available via django-tools: http://code.google.com/p/django-tools/
- forms
- manytomany
match filter
A filter that re.matches a regex against a value. Useful for nav bars as follows: {% if location.path|match:"/$" %} class="current"{% endif %} For `location.path` see my [location context_processor](/snippets/1685/).
- regex
- match
- nav
OracleAuthBackend
This code uses oracle as an authentication back end. It creates a new connection to the db and attempts to login. If successful it will then create an upper case User account with _ORACLE appended to the username. My urls.py call: from django.conf.urls.defaults import * urlpatterns = patterns('', (r'^accounts/login/$', 'django.contrib.auth.views.login', {'template_name': 'login.html'}), ) My setting.py specific settings: AUTHENTICATION_BACKENDS = ( 'oracleauth.views.OracleAuthBackend', ) LOGIN_URL = '/accounts/login/' ORACLE_CONNECT = 'database-host:1521/database' DEBUG=True
- authentication
- oracle
- login
- auth
- backend
simple unique_together check with M2M field
unique_together doesn't work with ManyToMany, yet. See: http://code.djangoproject.com/ticket/702 Here a simple test in save() that would raise a IntegrityError.
- unique_together
- manytomany
Redirect view based on GEO
Wanted a neat way to redirect views based on GeoIP determined criteria, from HTTP_REFERER. Decorator approach seemed the best way to make it straightforward to redirect views. To use, installed the Max Mind Python GeoIP API : http://www.maxmind.com/app/python
- view
- redirect
- geoip
Persistent Params Decorator
This snippet helps preserving query parameters such as page number when the view perform redirects. It does not support hooking templates and contexts currently.
- pagination
- url
- argument
Template class to test custom tag libraries
TestableTemplate behaves just like django.template.Template, but you can give it a list of template.Libraries to load before parsing the template. This is equivalent to adding a bunch of {% load %} tags to the beginning of your template string, but you can use custom tag libraries which do not belong to Django applications' templatetags packages. This is occasionally useful in testing.
- templates