Cannot assign "": "Blog.author" must be a "BlogAuthor" instance?

Question

Django

Hello! I want to add an article, I get the error Cannot assign ">": "Blog.author" must be a "BlogAuthor" instance?.
If you do not refer to the BlogAuthor model in Blog.author, but directly to the User everything works, you can add articles, but another error is displayed Cannot query "sk": Must be "User" instance.
How to link models so that there are no errors and everything works? models.py

code

class BlogAuthor(models.Model):
    """
    Model representing a blogger.
    """
    user = models.OneToOneField(User, on_delete=models.SET_NULL, null=True)
    bio = models.TextField(max_length=400, help_text="Enter your bio details here.")

    class Meta:
        ordering = ["user", "bio"]

    def get_absolute_url(self):
        """
        Returns the url to access a particular blog-author instance.
        """
        return reverse('blogs-by-author', args=[str(self.id)])

    def __str__(self):
        """
        String for representing the Model object.
        """
        return self.user.username


class Blog(models.Model):
    """
    Model representing a blog post.
    """
    name = models.CharField(max_length=200)
    author = models.ForeignKey(BlogAuthor, on_delete=models.SET_NULL, null=True)
    # Foreign Key used because Blog can only have one author/User, but bloggsers can have multiple blog posts.
    description = models.TextField(max_length=2000, help_text="Enter you blog text here.")
    post_date = models.DateField(default=date.today)

    class Meta:
        ordering = ["-post_date"]

    def get_absolute_url(self):
        """
        Returns the url to access a particular blog instance.
        """
        return reverse('blog-detail', args=[str(self.id)])

    def __str__(self):
        """
        String for representing the Model object.
        """
        return self.name

views.py

class BlogListbyAuthorView(generic.ListView):
    """
    Generic class-based view for a list of blogs posted by a particular BlogAuthor.
    """
    model = Blog
    paginate_by = 5
    template_name = 'blog/blog_list_by_author.html'

    def get_queryset(self):
        """
        Return list of Blog objects created by BlogAuthor (author id specified in URL)
        """
        id = self.kwargs['pk']
        target_author = get_object_or_404(BlogAuthor, pk=id)
        return Blog.objects.filter(author=target_author)

    def get_context_data(self, **kwargs):
        """
        Add BlogAuthor to context so they can be displayed in the template
        """
        # Call the base implementation first to get a context
        context = super(BlogListbyAuthorView, self).get_context_data(**kwargs)
        # Get the blogger object from the "pk" URL parameter and add it to the context
        context['blogger'] = get_object_or_404(BlogAuthor, pk=self.kwargs['pk'])
        return context


class BlogCreate(LoginRequiredMixin, CreateView):
    model = Blog
    fields = ['name', 'description']
    template_name = 'blog/blog_edit.html'

    def form_valid(self, form):
        form.instance.author = self.request.user
        return super().form_valid(form)

Answer 1

form.instance.author = self.request.user.blogauthor # или какой там related_name получается