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28 lines
No EOL
1.1 KiB
Python
28 lines
No EOL
1.1 KiB
Python
from django.db.models import OneToOneField
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from django.db.models.fields.related import ReverseOneToOneDescriptor
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class AutoSingleRelatedObjectDescriptor(ReverseOneToOneDescriptor):
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def __get__(self, instance, instance_type=None):
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try:
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return super(AutoSingleRelatedObjectDescriptor, self).__get__(instance, instance_type)
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except self.related.model.DoesNotExist:
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obj = self.related.model(**{self.related.field.name: instance})
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obj.save()
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return obj
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class AutoOneToOneField(OneToOneField):
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'''
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OneToOneField creates related object on first call if it doesnt exist yet.
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Use it instead of original OneToOne field.
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example:
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class MyProfile(models.Model):
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user = AutoOneToOneField(User, primary_key=True)
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home_page = models.URLField(max_length=255, blank=True)
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icq = models.IntegerField(max_length=255, null=True)
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'''
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def contribute_to_related_class(self, cls, related):
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setattr(cls, related.get_accessor_name(), AutoSingleRelatedObjectDescriptor(related)) |