Невозможно присвоить "<Пользователь: Euler>": "Article.authorr" должен быть экземпляром "User".
в чем проблема?
def change_names_of_field(apps, schema_editor):
Article = apps.get_model('blog', 'Article')
article = Article.objects.all()
for s in article:
s.authorr = User.objects.get(username=s.author)
if Category.objects.filter(title=s.category).values_list("title", flat=True) == []:
Category.objects.create(title=s.category)
s.categoryy = Category.objects.filter(title=s.category)
s.update = s.created
s.published = s.created
s.status = "p"
s.save()