Django snippets: Automatic Manager Choice Filters

Automatic Manager Choice Filters

from functools import partial
from django.db import models

class ChoiceFilterManager(models.Manager):
    def __init__(self, field, choices, *args, **kwargs):
        super(ChoiceFilterManager, self).__init__(*args, **kwargs)
        for k,v in dict(choices).items():
            setattr(self, v.lower(), partial(self.filter, **{field:k}))

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Automatically adds filter methods to your objects manager based on their display name.

class Foo(models.Model):
    MOO_CHOICES=((1,'foo'),(2,'bar'))
    moo = models.IntegerField(choices=MOO_CHOICES)
    objects = ChoiceFilterManager('moo',MOO_CHOICES)

Foo.objects.foo()
Foo.objects.bar()

Author:: nipuL
Posted:: January 23, 2009
Language:: Python
Django Version:: 1.0
Tags:: managers choices
Score:: 2 (after 2 ratings)

Tools

Comments

haplo (on December 12, 2011):

I think using a metaclass would be better than setattr in init().