如何在同一应用程序中动态将一个模型的一个或多个属性（FIELD）值添加到另一个模型

Question

无论何时创建TabletUser实例，我都希望分别从TestUsers模型（用户名，评估）到AssignmentAssessmentment模型（用户，评估）获取用户和评估。

class TabletUsers(models.Model):
    firstname = models.CharField(max_length=200)
    lastname = models.CharField(max_length=200)
    username = models.CharField(max_length=200, unique=True)
    password = models.CharField(max_length=200)
    paassword = models.CharField(max_length=200)
    District = models.ManyToManyField(District)
    Assessment = models.ManyToManyField(MasterAssessmentType)

    def __str__(self):
        return self.firstname + self.lastname


class AssignedAssessment(models.Model):
    user = models.ForeignKey(TabletUsers, on_delete=models.CASCADE)
    assessment = models.CharField(max_length=200)

    def __str__(self):
        return str(self.user)