update primary key (and cascade to child tables)
Management command to update a primary key and update all child-tables with a foreign key to this table.
- primary-key
- cascade
Snippet List
Admin Download as CSV File
This function downloads selected rows to CSV file. The snippet is based on snippet 1697 and 2020. This function downloads all columns given in the list_display, including callable items.
- admin
- csv
- export csv
Async PIL resize of images
Call resize_image to replace the image with a resized and normalized version of itself. I recommend doing this with celery, but you could also hook it up to the admin interface if you're not impatient.
- Images
- PIL
Django plugin for LoginRadius
Dependencies: urllib, simplejson
- login
- oauth
- social
- LoginRadius
Dump a model instance and related objects as a Python data structure
This utility makes a text dump of a model instance, including objects related by a forward or reverse foreign key. The result is a hierarchical data structure where * each instance is represented as a list of fields, * each field as a (<name>, <value>) tuple, * each <value> as a primitive type, a related object (as a list of fields), or a list of related objects. See the docstring for examples. We used this to make text dumps of parts of the database before and after running a batch job. The format was more useful than stock `dumpdata` output since all related data is included with each object. These dumps lend themselves particularly well for comparison with a visual diff tool like [Meld](http://meldmerge.org/).
- serialize
- dump
- model
- instance
Validating Model subclass
If you inherit from ValidatedModel instead of from models.Model, then full_clean() will be called before save(). So, add validators to your field definitions, and all your fields will be validated before they go to the database. The same thing can be accomplished with a pre_save signal, but the code is quite a bit messier than the simple inheritance above.
- model
- validation
- subclass
Take a django.core.mail email message and replace any MEDIA_URL-served images with attached images
The code here will take an EmailMessage from django.core.mail and replace the sourcing of any images served by the application with attached image content. Note: This expects a valid closing tag of **/>** on img elements, it will not properly handle filenames with **'** characters in it, and it does not handle if invalid image sources are listed.
- attachment
JSON instead of pickle for memcached
Standard memcache client uses pickle as a serialization format. It can be handy to use json, especially when another component (e.g. backend) doesn't know pickle, but json yes.
- memcache
- cache
- json
- memcached
- pickle
SOAP web service with soaplib 2.0
I've updated the `DjangoSoapApp` class from [this popular soaplib snippet](http://djangosnippets.org/snippets/2210/) so the snippet will work properly with soaplib 2.0. Usage is the same as before: my_soap_service = DjangoSoapApp([MySOAPService], __name__)
- soap
- soaplib
- wsdl
another request logging middleware with request time and extra info
Simple logging middleware that captures the following: * remote address (whether proxied or direct) * if authenticated, then user email address * request method (GET/POST etc) * request full path * response status code (200, 404 etc) * content length * request process time * If DEBUG=True, also logs SQL query information - number of queries and how long they took
- middleware
- request-path
- time
- request
- logging
- time-logging
create or update, then get, model instances from JSON/py dict
Basically the idea is to import/update model instances from a json data that closely matches the model structure (i.e. identical field names) From my answer to this question: [http://stackoverflow.com/a/8377382/202168](http://stackoverflow.com/a/8377382/202168) See the original question for sample data format.
- json
- import
decorator for decorators with optional args
Have you ever wanted a decorator that you could apply either straight-out: @mydec def myfun(...): ... or with special arguments: @mydec(special=foo) def myfun(...): ... ? Well, decorate it with this metadecorator, and voila. (I had this idea independently, but it's been done before as decorator_withargs: http://osdir.com/ml/python.ideas/2008-01/msg00048.html. My version is actually useful because it deals with signatures and calling directly.) As http://www.siafoo.net/article/68 points out, the standard decorator module has too much magic: the "@decorator" decorator expects a wrapping function, not a working decorator. This module fixes that.
- decorator
- decoratordecorator
- metadecorator
Cached model property decorator (like @property)
This is a nice decorator for using the cache to save the results of expensive-to-calculate but static-per-instance model properties. There is also a decorator for when the property value is another model, and the contents of the other model should not be cached across requests. 3 levels of caching implemented: * outermost: django cache * middle: obj._cache (for multiple properties on a single object) * innermost: replace the attribute on this object, so we can entirely avoid running this function a second time.
- property
- cache
- decorator
Complete Persian DateTime Widget
These are the whole scripts that worked for me as a django (1.3) persian datetime widget.
- Widget
- Persian
- DateTime
The model field subclass returns string generated from the list of choices.
if you have multiple choice field in front and you need just a string contains chosen values this is it! Unicode encoding row related with another snippet - "Switched value typed choice field", In typical cases, you do not need to call additional methods.
- model_field