无法在Django中检查多行字符串

如何解决无法在Django中检查多行字符串

我实际上想检查用户的答案是correct还是incorrect。 当我尝试使用纯python代码处理伪数据时，它可以正常工作。

但是，当我尝试将其添加到django中时，它对多行无效，而 仅对一行有效 。
无论如何我也尝试了3种方法，但仍然不起作用。在我看来，也许是因为\n问题。
我检查了（type和correct_answer的两个user_answer，它完全给了我<class 'str'>。

class UserAnswerView(APIView):
    allowed_methods = ('post',)
    permission_classes = (permissions.AllowAny,)  # just for test
    serializer_class = UserAnswerSerializer

    def validate_answer(self,exercise_id,user_answer):
        exercise = Exercise.objects.get_or_none(id=exercise_id)
        if exercise and user_answer:
            if isinstance(user_answer,str):
                correct_answers = exercise.answer_set.published()
                # [method 1]
                # return correct_answers.filter(Q(answer__icontains=user_answer)).exists()

                # [method 2]
                # for correct_answer in correct_answers:
                #     if correct_answer.answer == user_answer:
                #         return True

                # [method 3]
                return any(c.answer == user_answer for c in correct_answers)
        return False

这里是models.py;

class Exercise(TimeStampedModel):
    id = models.BigAutoField(primary_key=True)
    title = models.CharField(_('Title'),max_length=200)
    order = models.PositiveIntegerField(_('Order'),default=1)
    course = models.ForeignKey(Course,on_delete=models.CASCADE)
    sort_description = models.TextField(_('Sort Description'))
    description = models.TextField(_('Description'))
    initial_script = models.TextField(_('Initial Script'),blank=True)

    objects = CustomManager()

    def __str__(self):
        return self.title


class Answer(TimeStampedModel):
    id = models.BigAutoField(primary_key=True)
    exercise = models.ForeignKey(Exercise,on_delete=models.CASCADE)
    answer = models.TextField(_('Answer'),help_text=_('The correct answer'))

    objects = CustomManager()

    def __str__(self):
        return self.answer[:50]

在测试中，我将此代码放入了user_answer表单中，也将其放入了correct_answer。

from datetime import datetime

now = datetime.now()
print(now)

无论如何，我还在数据库中放置了一些 有效答案 ；

使用$.ajax post方法处理的请求也为DRF，并且所有请求数据都发送到后端。

解决方法

在这里，问题出在\r以某种方式添加的数据库中。因此，我需要更换它。在测试中，我试图将它们打印为列表模式：

number = 0
for canswer in correct_answers:
    number += 1

    print([number,canswer.answer])
    print([number,user_answer])
    print('')

与发现的大问题不一样；

[1,'from datetime import datetime\r\nnow = datetime.now()\r\nprint(now)']
[1,'from datetime import datetime\n\nnow = datetime.now()\nprint(now)']

[2,'from datetime import datetime\r\n\r\nnow = datetime.now()\r\nprint(now)']
[2,'from datetime import datetime\n\nnow = datetime.now()\nprint(now)']

所以，我只需要替换它；

for canswer in correct_answers:
    correct_answer = canswer.answer.replace('\r','')
    user_answer = user_answer.replace('\r','')

    if correct_answer == user_answer:
        return True