Question

model:

class Province(models.Model):
    user = models.ManyToManyField(User, blank=True)
    name = models.CharField(max_length=30, unique=True)

class City(models.Model):
    name = models.CharField(max_length=100, unique=True)
    slug = models.SlugField(max_length=100, editable=False, unique=False)
    ownership = models.ManyToManyField(User, through='UserCity')


class UserCity(models.Model):
    user = models.ForeignKey(User)
    province = models.ForeignKey(Province)
    city = models.ForeignKey(City)


class District(models.Model):
    name = models.CharField(max_length=100, unique=True)
    slug = models.SlugField(max_length=100, unique=True, editable=False)
    ownership = models.ManyToManyField(User, through='UserDistrict')

class UserDistrict(models.Model):
    user = models.ForeignKey(User)
    province = models.ForeignKey(Province)
    city = models.ForeignKey(City)
    district = models.ForeignKey(District)

How can I delete relation when I know user_id and province_id? If i user delete() method it also removes province and I want to avoid it. I can’t find anywhere how to delete 1 specific relation in m2m field.

Answer 1

Use the remove method on your ManyToMany manager.

Province.objects.get(id=3).user.remove(user_id)

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You can also access the through table directly if you so desire:

Province.user.through.objects.get(province__id=3, user__id=4).delete()