[英]How to properly remove a specific ManyToMany relationship?
我與其中一個模型有ManyToMany關系。 在刪除孩子時,我想刪除該關系,但保留該記錄,因為其他對象可能正在使用該記錄。 在調用刪除視圖時,出現AttributeError錯誤:
異常值:“ QuerySet”對象沒有屬性“ clear”
這是我的models.py:
class Feed(models.Model):
username = models.CharField(max_length=255, unique=True)
class Digest(models.Model):
name = models.CharField(max_length=255)
user = models.ForeignKey(User)
items = models.PositiveIntegerField()
keywords = models.CharField(max_length=255, null=True, blank=True)
digest_id = models.CharField(max_length=20, unique=True)
time_added = models.DateTimeField(auto_now_add=True)
active = models.BooleanField(default=1)
feeds = models.ManyToManyField(Feed)
以及views.py的相關部分:
def feed_delete(request, id):
digest = get_object_or_404(Digest, id=id)
if digest.user == request.user:
Feed.objects.get(id=request.POST.get('id')).digest_set.filter(id=id).clear()
return HttpResponseRedirect(digest.get_absolute_url())
清除摘要摘錄上的字段
digest = get_object_or_404(Digest, id=id)
if digest.user == request.user:
digest.feeds.clear()
#do your processing
回應您的評論。
digest = get_object_or_404(Digest, id=id)
if digest.user == request.user:
feed=digest.feeds.get(id=2)#get an instance of the feed to remove
digest.feeds.remove(feed)#remove the instance
希望這可以幫助!
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