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python - 无法在 django 中检查多行字符串

问题描述

我实际上想检查用户的答案是corrector incorrect。当我尝试使用纯 python 代码输入虚拟数据时，它可以正常工作。

蟒蛇版本

但是，当我尝试将它添加到 django 中时，它对多行无效， 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( correct_answer& user_answer) 的两个 s，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]

在我的测试中，我将此代码放入user_answer表单中，并且correct_answer.

from datetime import datetime

now = datetime.now()
print(now)

反正我也在数据库里放了一些有效的答案；

有效答案

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

标签： pythondjangostringdjango-3.1

解决方案

在这里，问题出在数据库中，它以某种方式添加\r。所以，我需要更换它。在我的测试中，我试图将它们打印到列表模式中：

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

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

并且发现了BIG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，我只需要更换它；

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

    if correct_answer == user_answer:
        return True

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