Opened 9 years ago

Last modified 2 years ago

#26706 closed Bug

ManyToMany clear doesn't clear the items from the object but deletes from db — at Initial Version

Reported by: Sharat M R Owned by: nobody
Component: Database layer (models, ORM) Version: dev
Severity: Normal Keywords: manytomany m2m clear
Cc: mattdentremont@… Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description 

class Media(models.Model):
    name = models.CharField(max_length=100)


class Tag(models.Model):
    tag = models.CharField(max_length=100)
    medias = models.ManyToManyField(Media)

    def __unicode__(self):
        return self.tag

Assume tag object below already has three items of Media model in medias which are saved in db. [m1, m2, m3].

tag = Tag.objects.get(id=1)
tag.medias.clear()
print(tag.medias.all())

The above code prints all the three [m1, m2, m3]. Fetching the tag again using get and printing givens an empty list "[ ]"

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