On 5/2/2009 6:07 AM, Paddy Joy wrote:
> I have a model "Car" with a related model "Car_Attribute" where I
> store instance specific details.
>
>
> class Car(models.Model):
> name = models.CharField(max_length=50)
>
> class Car_Attribute(models.Model):
> car = models.ForeignKey(Car)
> key = models.CharField(max_length=50)
> data = models.TextField()
>
> I have written a custom template filter to retrieve attributes
>
> from django import template
>
> register = template.Library()
>
> @register.filter(name='car_tag_get')
> def car_tag_get(value, arg):
> try:
> return value.car_attribute_set.get(key=arg).data
> except:
> return "#CAR_ATTRIBUTE_NOT_FOUND key: %s" % arg
> car_tag_get.is_safe = False
>
> and in my templates I use
>
> {{ car|car_tag_get:"colour" }}
>
> This works fine but is there an easier or more practical way?
<http://docs.python.org/reference/datamodel.html#object.__getattr__> on
your Car model is perhaps the way to go.
--
George
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