def add_to_revision(instance, revision_set):
"""
Calculates the objects that should be included in the same revision as the
given instance.
All calculated objects are added to the `revision_set`.
"""
# Prevent recursion.
if instance in revision_set:
return
revision_set.add(instance)
# Follow relations.
fields, follow, format = get_registration_info(instance.__class__)
if follow:
for relationship in follow:
try:
# Clear foreign key cache.
related_field = instance._meta.get_field(relationship)
if isinstance(related_field, models.ForeignKey):
if hasattr(instance, related_field.get_cache_name()):
delattr(instance, related_field.get_cache_name())
except models.FieldDoesNotExist:
pass
related = getattr(instance, relationship, None)
if isinstance(related, models.Model):
add_to_revision(related, revision_set)
elif isinstance(related, (models.Manager, QuerySet)):
for related_obj in related.all():
add_to_revision(related_obj, revision_set)
elif related is not None:
raise TypeError, "Cannot follow the relationship '%s', unexpected type %s" % (
relationship, type(related).__name__)
def add_to_revision(instance, revision_set):
"""
Calculates the objects that should be included in the same revision as the
given instance.
All calculated objects are added to the `revision_set`.
"""
# Prevent recursion.
if instance in revision_set:
return
revision_set.add(instance)
# Follow relations.
fields, follow, format = get_registration_info(instance.__class__)
if follow:
for relationship in follow:
try:
# Clear foreign key cache.
related_field = instance._meta.get_field(relationship)
if isinstance(related_field, models.ForeignKey):
if hasattr(instance, related_field.get_cache_name()):
delattr(instance, related_field.get_cache_name())
except models.FieldDoesNotExist:
pass
related = getattr(instance, relationship, None)
if isinstance(related, models.Model):
add_to_revision(related, revision_set)
elif isinstance(related, (models.Manager, QuerySet)):
for related_obj in related.all():
add_to_revision(related_obj, revision_set)
elif related is not None:
raise TypeError, "Cannot follow the relationship '%s', unexpected type %s" % (relationship, type(related).__name__)
def end(self):
"""Ends a revision."""
self._assert_active()
self._depth -= 1
# Handle end of revision conditions here.
if self._depth == 0:
try:
if self._versions and not self._is_invalid:
# Save a new revision.
revision = Revision.objects.create(user=self._user,
comment=self._comment)
revision_set = set()
# Follow relationships.
for version in self._versions:
add_to_revision(version, revision_set)
# Save version models.
for obj in revision_set:
fields, follow, format = get_registration_info(obj.__class__)
object_id = unicode(obj.pk)
content_type = ContentType.objects.get_for_model(obj)
serialized_data = serializers.serialize(format, [obj], fields=fields)
Version.objects.create(revision=revision,
object_id=object_id,
content_type=content_type,
format=format,
serialized_data=serialized_data,
object_repr=unicode(obj))
for meta_cls, meta_kwargs in self._meta:
meta_cls._default_manager.create(revision=revision, **meta_kwargs)
finally:
self._clear()
return False
