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As you have a ManyToManyField, you first need to create the Follows
object (save it), so that it has a primary key in order for the many-to-many relationship to work. In addition, you need to use the ManyToManyManager to add items to the relationship.
In short, you need to do this:
f = Followers()
f.save()
f.user.add(u1)
f.follower.add(u2)
f.save()
Source:stackexchange.com