Django属性错误：'int'对象没有属性'essay_question' - Django测验应用程序 [英] Django Attribute Error: 'int' object has no attribute 'essay_question' - Django quiz app
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问题描述
在将Django Quiz应用程序集成到我的项目中时，我不断收到此错误，并且不知道如何解决它。我可以创建测验，并在列表中看到它们，但是一旦按下开始测验按钮，我就会收到这个错误。在我的项目中需要改变什么来解决这个问题？
I keep getting this error while integrating Django Quiz app into my project and don't know how to solve it. I can create the quizzes and see them in the list just fine, but as soon as I press the button 'Start Quiz', I get this error. What do I need to change in my project to solve this problem?
这是完整的追溯：
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/quizzes/testquiz/take/
Django Version: 1.9.1
Python Version: 2.7.10
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'myapp',
'essay',
'quiz',
'multichoice',
'true_false',
'bootstrapform']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback:
File "/home/john/.virtualenvs/lfs/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "/home/john/.virtualenvs/lfs/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/john/.virtualenvs/lfs/local/lib/python2.7/site-packages/django/views/generic/base.py" in view
68. return self.dispatch(request, *args, **kwargs)
File "/home/john/myapp/quiz/views.py" in dispatch
148. self.quiz)
File "/home/john/myapp/quiz/models.py" in user_sitting
341. sitting = self.new_sitting(user, quiz)
File "/home/john/myapp/quiz/models.py" in new_sitting
312. if len(question_set) == 0:
File "/home/john/.virtualenvs/lfs/local/lib/python2.7/site-packages/django/db/models/query.py" in __len__
240. self._fetch_all()
File "/home/john/.virtualenvs/lfs/local/lib/python2.7/site-packages/django/db/models/query.py" in _fetch_all
1074. self._result_cache = list(self.iterator())
File "/home/john/.virtualenvs/lfs/local/lib/python2.7/site-packages/model_utils/managers.py" in iterator
80. sub_obj = self._get_sub_obj_recurse(obj, s)
File "/home/john/.virtualenvs/lfs/local/lib/python2.7/site-packages/model_utils/managers.py" in _get_sub_obj_recurse
153. node = getattr(obj, rel)
Exception Type: AttributeError at /quizzes/testquiz/take/
Exception Value: 'int' object has no attribute 'essay_question'
这里是文章应用程序的模型：
And here's the models for essay app:
from __future__ import unicode_literals
from django.utils.encoding import python_2_unicode_compatible
from django.utils.translation import ugettext as _
from quiz.models import Question
@python_2_unicode_compatible
class Essay_Question(Question):
def check_if_correct(self, guess):
return False
def get_answers(self):
return False
def get_answers_list(self):
return False
def answer_choice_to_string(self, guess):
return str(guess)
def __str__(self):
return self.content
class Meta:
verbose_name = _("Essay style question")
verbose_name_plural = _("Essay style questions")
EDITED：这是问题模型：
EDITED: Here's the Question model:
@python_2_unicode_compatible
class Question(models.Model):
"""
Base class for all question types.
Shared properties placed here.
"""
quiz = models.ManyToManyField(Quiz,
verbose_name=_("Quiz"),
blank=True)
category = models.ForeignKey(Category,
verbose_name=_("Category"),
blank=True,
null=True)
sub_category = models.ForeignKey(SubCategory,
verbose_name=_("Sub-Category"),
blank=True,
null=True)
figure = models.ImageField(upload_to='uploads/%Y/%m/%d',
blank=True,
null=True,
verbose_name=_("Figure"))
content = models.CharField(max_length=1000,
blank=False,
help_text=_("Enter the question text that "
"you want displayed"),
verbose_name=_('Question'))
explanation = models.TextField(max_length=2000,
blank=True,
help_text=_("Explanation to be shown "
"after the question has "
"been answered."),
verbose_name=_('Explanation'))
objects = InheritanceManager()
class Meta:
verbose_name = _("Question")
verbose_name_plural = _("Questions")
ordering = ['category']
def __str__(self):
return self.content
其他型号和视图可以在这里找到： https://github.com/tomwalker/django_quiz
Other models and views can be found here: https://github.com/tomwalker/django_quiz
任何帮助都不胜感激。
推荐答案
看看你的代码，我觉得这个问题在你的SittingManager中。你在做：
Looking through your code, I think the problem lies within your SittingManager. You are doing:
question_set = question_set.values_list('id', flat=True)
if len(question_set) == 0:
...
我会推荐： / p>
I would recommend:
question_ids = question_set.values_list('id', flat=True)
if question_set.count() == 0:
...
# or less performant
# if len(list(question_ids)):
# ...
在进一步评估中使用 question_ids 。
有关详细信息，请浏览文档 here
And work with the question_ids in your further evaluation.
For more information on this, browse the docs here
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