For a model I need subclassing which is work on progres. Falling back
to a OneToOne approach seems tricky because "the semantics of one-to-
one relationships will be changing soon". I'm wondering now what to
do. Here's my model in the OneToOne approach.
class Cropcat(models.Model):
parent = models.ForeignKey('self', blank=True, null=True,
related_name='child_set')
name = models.CharField(maxlength=70)
slug = models.SlugField(unique=True, prepopulate_from=('name',))
text = models.TextField()
class Cropdescription(models.Model):
name = models.CharField(maxlength=70)
history = models.TextField()
etc.
class Crop(models.Model):
cropcat = models.ForeignKey(Cropcat, blank=True, null=True,
limit_choices_to = {'parent__isnull': False})
cropdescription = models.OneToOneField(Cropdescription)
class Cropvar(models.Model):
parent = models.ForeignKey(Crop)
cropdescription = models.OneToOneField(Cropdescription)
As you can see, all common fiels for Crop and Cropvar live in
Cropdescription. Crop has an extra field for Cropcat. Cropvar has an
extra field for patent which is a Crop.
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