Django - Automatically add the request user to a form field in CBV via mixin

mixins.py

from django.contrib.auth.mixins import LoginRequiredMixin


class SetUserMixin(LoginRequiredMixin):
    """
    Automatically add `self.request.user` to a specified `user_field`. `use_field` defaults to "user"
    """

    user_field = "user"

    def form_valid(self, form):
        setattr(form.instance, self.user_field, self.request.user)
        return super().form_valid(form)

models.py

from django.db import models
from django.conf import settings

class MyModel(models.Model):
    my_user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    name = models.CharField(max_length=255)

views.py

from django.views.generic.edit import CreateView
from .models import MyModel
from .mixins import SetUserMixin

class MyModelCreateView(SetUserMixin, CreateView):
    model = MyModel
    template_name = "my_app/template.html"
    fields = ("name",)
    success_url = reverse_lazy("my-app-view")
    user_field = "my_user"