在 django 中扩展基础模型

Question

我想为名为

Question

的问题创建基础模型 并通过任何其他问题类型扩展它：

class Question(models.Model):
    questionnaire = models.ForeignKey(to='Questionnaire', on_delete=models.CASCADE, related_name='questions')
    question = models.TextField()
    description = models.TextField(null=True, blank=True)
    media = models.FileField(upload_to='medias', blank=True, null=True)
    is_required = models.BooleanField(default=False)

    def __str__(self):
        return f'{self.questionnaire.name} - {self.question}'

我想像这样扩展它：

class OptionalQuestion(Question):
    multiple_choice = models.BooleanField(default=False)
    additional_options = models.BooleanField(default=False)
    # If multiple_choice is True, then max_selected_options and min_selected_options will be used
    max_selected_options = models.IntegerField(null=True, blank=True)
    min_selected_options = models.IntegerField(null=True, blank=True)

    # If additional_options is True, then all_options and nothing_selected will be used
    all_options = models.BooleanField(default=False, null=True, blank=True)
    nothing_selected = models.BooleanField(default=False, null=True, blank=True)

    def save(self, *args, **kwargs):
        if not self.multiple_choice:
            self.max_selected_options = None
            self.min_selected_options = None
        if not self.additional_options:
            self.all_options = None
            self.nothing_selected = None
        if self.nothing_selected or self.all_options:
            self.all_options = False
            self.multiple_choice = False
        super().save(*args, **kwargs)

第一次创建migrations一切都好 但是下次 Django 要我为 'question_ptr' 字段提供默认值时，我什至不知道这个字段是什么

我尝试将基类抽象化，并且在进行迁移时 Django 向我显示了很多这样的错误：

question_app.TextAnswerQuestion.questionnaire: (fields.E305) Reverse query name for 'question_app.TextAnswerQuestion.questionnaire' clashes with reverse query name for 'question_app.DropDownQuestion.questionnaire'.
        HINT: Add or change a related_name argument to the definition for 'question_app.TextAnswerQuestion.questionnaire' or 'question_app.DropDownQuestion.questionnaire'.
question_app.TextAnswerQuestion.questionnaire: (fields.E305) Reverse query name for 'question_app.TextAnswerQuestion.questionnaire' clashes with reverse query name for 'question_app.NumberAnswerQuestion.questionnaire'.
        HINT: Add or change a related_name argument to the definition for 'question_app.TextAnswerQuestion.questionnaire' or 'question_app.NumberAnswerQuestion.questionnaire'.
question_app.TextAnswerQuestion.questionnaire: (fields.E305) Reverse query name for 'question_app.TextAnswerQuestion.questionnaire' clashes with reverse query name for 'question_app.OptionalQuestion.questionnaire'.
        HINT: Add or change a related_name argument to the definition for 'question_app.TextAnswerQuestion.questionnaire' or 'question_app.OptionalQuestion.questionnaire'.

不知道怎么办