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40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
# Copyright (c) 2013 AnsibleWorks, Inc.
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# All Rights Reserved.
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# Django
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from django.db import models
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from django.db.models.fields.related import SingleRelatedObjectDescriptor
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# South
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from south.modelsinspector import add_introspection_rules
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__all__ = ['AutoOneToOneField']
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# Based on AutoOneToOneField from django-annoying:
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# https://bitbucket.org/offline/django-annoying/src/a0de8b294db3/annoying/fields.py
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class AutoSingleRelatedObjectDescriptor(SingleRelatedObjectDescriptor):
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"""Descriptor for access to the object from its related class."""
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def __get__(self, instance, instance_type=None):
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try:
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return super(AutoSingleRelatedObjectDescriptor,
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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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if self.related.field.rel.parent_link:
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for f in instance._meta.local_fields:
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setattr(obj, f.name, getattr(instance, f.name))
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obj.save()
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return obj
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class AutoOneToOneField(models.OneToOneField):
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"""OneToOneField that creates related object if it doesn't exist."""
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def contribute_to_related_class(self, cls, related):
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setattr(cls, related.get_accessor_name(),
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AutoSingleRelatedObjectDescriptor(related))
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add_introspection_rules([([AutoOneToOneField], [], {})],
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[r'^awx\.main\.fields\.AutoOneToOneField'])
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