Django relations

class Lecturer(models.Model):
    first_name = models.CharField(max_length=100,)
    last_name = models.CharField(max_length=100,)

    def __str__(self):
        return f"{self.first_name} {self.last_name}"


class Subject(models.Model):
    name = models.CharField(max_length=100,)
    code = models.CharField(max_length=10,)
    lecturer = models.ForeignKey("Lecturer", on_delete=models.SET_NULL, null=True)

    def __str__(self):
        return f"{self.name}"