How to hide or make it impossible to edit input in the admin?

Question

Django

Made model with user = models.ForeignKey(). It is used by all users/groups who have rights to create a post, but it needs to be editable only by superusers (only 1 input from the entire form). Where should I write the check? As far as I understand, then models is work with the database, it turns out that you need to write in admin.py?

class Post(models.Model):
    user = models.ForeignKey(
        User,
        verbose_name="Пользователь",
        on_delete=models.CASCADE,
        default = User.id)

Answer 1

Django documentation / The Django admin site / ModelAdmin options / ModelAdmin.readonly_fields