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Editorial Team
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Asked: 2026-06-14T21:59:22+00:00

class Subscribers(User): date = models.DateField() user = models.OneToOneField(User) class Tour(models.Model): owner_id = models.ForeignKey(User) name

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class Subscribers(User):
    date = models.DateField()
    user = models.OneToOneField(User)

class Tour(models.Model):
    owner_id = models.ForeignKey(User)
    name = models.CharField(max_length=50)
    location = models.ManyToManyField(Location)
    subscribers = models.ManyToManyField(Subscribers, related_name="sub")

I am trying to do this in another file:

user1 = User.objects.create_user('John','j@j.com','j1')
user2= User.objects.create_user('Mike','m@m.com','m1')
user3= User.objects.create_user('kokoko','m@m.com','m1')
user4= User.objects.create_user('lalal','m@m.com','m1')
sub = Subscribers()
tour = Tour()
tour.id = "1"
tour.name = "hello"
tour.owner_id = user1
tour.subscribers = sub

but I have this error:
TypeError: add() argument after * must be a sequence, not Subscribers

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1 Answer

  1. Editorial Team

    The ManyToMany manager assumes that when you do

    tour.subscribers = sub

    sub is a sequence (tuple, list, queryset) of Subscribers, not a single object. Then doing so is the exact same as doing:

    tour.subscribers.add(*sub)

    And since sub is not a sequence, it throws such error. I would recommend saving first and adding later. I think it’s also more readable, but it may be just my opinion:

    sub = Subscribers()
tour = Tour()
tour.id = "1"
tour.name = "hello"
tour.owner_id = user1
tour.save()
tour.subscribers.add(sub)

    Hope this helps 🙂

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