我想仅在 django-reversion 中发生更改时才保存新对象版本。我浏览了文档并没有找到任何关于它的信息。我怎样才能实现它?
最佳答案
您可以使用 the ignore_duplicates
option .很遗憾
It doesn't follow relations, as that can get expensive and slow very quickly.
如果您真的想忽略跟随关系的重复项,您有两种可能性:
删除
and explicit
这里https://github.com/etianen/django-reversion/blob/master/reversion/revisions.py#L199套装
ignore_duplicates
如 True
默认 https://github.com/etianen/django-reversion/blob/master/reversion/revisions.py#L368小心,如上所述,它可能很慢。
套装
ignore_duplicates
如 False
并添加信号接收器:from django.db import transaction
from django.dispatch import receiver
from reversion.models import Revision, Version
from reversion.signals import post_revision_commit
def clear_versions(versions, revision):
count = 0
for version in versions:
previous_version = Version.objects.filter(
object_id=version.object_id,
content_type_id=version.content_type_id,
db=version.db,
id__lt=version.id,
).first()
if not previous_version:
continue
if previous_version._local_field_dict == version._local_field_dict:
version.delete()
count += 1
if len(versions_ids) == count:
revision.delete()
@receiver(post_revision_commit)
def post_revision_commit_receiver(sender, revision, versions, **kwargs):
transaction.on_commit(lambda: clear_versions(versions, revision))
它也可能很慢,但您可以异步执行(例如,在 Celery 任务中):
# tasks.py
@celery.task(time_limit=60, ignore_result=True)
def clear_versions(revision_id, versions_ids):
count = 0
if versions_ids:
for version in Version.objects.filter(id__in=versions_ids):
previous_version = Version.objects.filter(
object_id=version.object_id,
content_type_id=version.content_type_id,
db=version.db,
id__lt=version.id,
).first()
if not previous_version:
continue
if previous_version._local_field_dict == version._local_field_dict:
version.delete()
count += 1
if len(versions_ids) == count:
Revision.objects.only('id').get(id=revision_id).delete()
# signals.py
@receiver(post_revision_commit)
def post_revision_commit_receiver(sender, revision, versions, **kwargs):
transaction.on_commit(
lambda: clear_versions.delay(revision.id, [v.id for v in versions])
)
关于django - 如果 Django-reversion 中没有任何变化,则不要创建新版本,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30439461/