Get object/list or None
1. Function - get_obj_or_none Returns an object or a None Value 2. Function - get_list_or_none Returns a list object or None Value
- "get_obj_or_none"
- "get_list_or_none"
Snippet List
typo_comparison
This is simple validation weather a string is close enough to what we want. First param is keyword we are comparing to Second is user's input and third is tolerance level. Its very rudimentary. I have my mind fixed upon some imperfections. I am trying to make it good for human like(crazy keyboard) error.
- comparison
- errors
- typo
- validate
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
superSearch function for generating large OR queries
superSearch is intended to make it easier to make complex OR queries, thusly hitting the database less. EXAMPLE: Searching for a user named 'Eric Neuman' would be difficult because first_name and last_name are separate fields. However, with superSearch, it's a breeze. query = ['Eric Neuman'] f = ['first_name','last_name'] s = query.split(' ') m = ['icontains'] results = superSearch(User, f, m,s)
- dynamic
- q
- query
- kwargs
CategoriesField
If you have a relatively small finite number of categories (e.g. < 64), don't want to add a separate column for each one, and don't want to add an entire separate table and deal with joins, this field offers a simple solution. You initialize the field with a list of categories. The categories can be any Python object. When saving a set of categories, the field converts the set to a binary number based on the indices of the categories list you passed in. So if you pass in as your categories list [A,B,C,D] and set model.categories = [C,D], the integer stored in the database is 0b1100 (note that although the categories list has a left-to-right index, the binary number grows right-to-left). This means that if you change the order of your category list once you have data in the DB, you'll need to migrate the data over to the new format. Adding items to the list should be fine however. If you need to do filtering based on this field, you can use bitwise operators. Django currently (to my knowledge) doesn't support this natively, but most DBs have some bitwise operator support and you can use the extra function for now. For example, this query will select CheeseShop models that have the 'Gouda' in its cheeses field. `CheeseShop.objects.all().extra(where=['cheeses | %s = cheeses'], params=[CHEESES.index('Gouda')])`
- field
- categories
- binary
StateField
Based on [CountryField](http://www.djangosnippets.org/snippets/494/).
- model
- field
- state
- statefield
Automatically strip CharFields
Modifies CharField so that it's value is stripped before cleaning. Put before your forms class or somewhere higher (urls, models).
- fields
- forms
- strip
RSS feed authentication
This is a very simple way of getting authenticated RSS feeds in django, by slightly changing the django.contrib.syndication.views 1) copy django/contrib/syndication/views.py into mysite/feeds/views.py 2) replace the contents of that file with the snippet 3) any feeds which you require login just add them to the auth_required list. In this case I require login for /feeds/mystuff/ so I make auth_required = ['mystuff'] My directory structure is like this: mysite/feeds/ views.py feedmodels.py feedmodels.py is just where you make your feed models (see http://docs.djangoproject.com/en/dev/ref/contrib/syndication/ where they give an example of "LatestEntries") [urls.py] - this is what I add in urls.py from mysite.feeds.feedmodels import Latest,MyPersonalStuff feeds = { 'latest':Latest, 'mystuff':MyPersonalStuff, } (r'^feeds/(?P<url>.*)/$', 'mysite.feeds.views.feed', {'feed_dict': feeds}), ###########################################################################
- authentication
- feed
- rss
- simple
Test IP against IP address+Subnet whitelist
Simple function that tests whether a given IP address is in a list of IP addresses or subnets. Requires `ipaddr`. Comes with Python 2.7 or 3.1, [downloadable here](http://code.google.com/p/ipaddr-py/) for earlier versions. More info on `ipaddr` [in Python 3.1 docs](http://docs.python.org/dev/py3k/library/ipaddr.html).
- ip-address
- whitelist
- ipaddr
- subnet
Template tag: Last x twitter msgs of user
A template tag which returns the n last tweets of a given user. It uses the twitter python lib. {% get_twitter_messages user foo limit 5 as tweets %} {% for tweet in tweets %} {{ tweet.text }} {{ tweet.time }} {{ tweet.url }} {% endfor %}
- templatetag
web-key: Base64 Shared Secret for Access Control
At the [Internet Identity Workshop](http://iiw.idcommons.net/Iiw8) in May, 2009, I spoke to Alan Karp and Tyler Close of HP Labs about their research on authorization without identity. Here are my [Delicious links](http://delicious.com/sbwms/ZBAC) on the subject. This led me to write code to generate a "web-key," the shared secret needed to implement the access control method discussed. In his paper, Tyler Close recommends 70 bits for the shared secret, encoded as a 13-character Base32 string. I used 72 bits, so the secret is a 12-character, URL-safe Base64 string without padding characters. I'm new to Python and Django, so I welcome refinements!
- password
- web-key
- webkey
- zbac
- access-control
make templates fail loudly in dev
Add the line shown, or something similar, to your settings/dev.py, so that you can more clearly see when django is silently hiding errors in your template tags.
- template
- debugging
MultipleEmailsField
This is a custom field for multiple emails separated by comma. Original code was replaced by code from Django documentation: http://docs.djangoproject.com/en/dev/ref/forms/validation/ (MultiEmailField) so i'm not the author of the code, but just put it here to replace an outdated solution. Uses code from mksoft comment http://www.djangosnippets.org/snippets/1093/
- multiple
- forms
- field
Non-Javascript select list navigator
If you need a simple select list (picklist) containing all site categories (or some other taxonomic group) and don't want to depend on Javascript, here's how to build a simple category navigator in Django, using HttpResponseRedirect.
- form
- select
- picklist