On Mar 6, 2010, at 10:37 AM, Matthew Warren wrote:
Hi,
I have a model like the following;
class elements(models.Model):
name=models.CharField(max_length=21)
class grouping(models.Model):
name=models.CharField(max_length=48)
elementgroup=models.ForeignKey(elements)
I'm assuming this means that a grouping may relate to multiple
elements, but an element may only be related to a single group.
It's the other way around. As written, a grouping can only relate to
a single element, but each element can have any number of groupings.
You can think of the ForeignKey field a pointer, pointing from the
grouping to the element. It's a real field, so it can only have one
value per instance. If what you want is for one element to only have
a single grouping, but each grouping to have multiple elements, the
ForeignKey goes in the element, not the grouping.
--
-- Christophe Pettus
x...@thebuild.com
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