我想请你帮忙。我想创建一个简单的问题投票系统。我成功了,然后我想限制用户每24小时只投票一次,但我失败了
我知道我想要实现什么,但我不知道如何编写代码
现在,由于我的错误,我限制每24小时对这个问题投票一次。相反,我想限制一个用户每24小时就每个问题投票一次。所以我犯了一个愚蠢的错误。这是我的错误代码:
models.py:
class Question(models.Model):
question = models.CharField(max_length=300)
answered = models.BooleanField(default=False)
created = models.DateTimeField(auto_now_add=True)
datecompleted = models.DateTimeField(null=True, blank=True)
user = models.ForeignKey(User, on_delete=models.CASCADE)
votesscore = models.IntegerField(default='0')
votescoresubmitted = models.DateTimeField(null=True, blank=True)
amountofvotes = models.IntegerField(default='0')
def __str__(self):
return self.question
views.py:
@login_required()
def questionvoteup(request, question_pk):
question = get_object_or_404(Question, pk=question_pk, user=request.user)
if request.is_ajax() and request.method == "POST":
if question.votescoresubmitted is None or timezone.now() > question.votescoresubmitted + timedelta(minutes=1440):
question.votesscore += 1
question.amountofvotes += 1
question.votescoresubmitted = timezone.now()
question.save()
data = {
"msg": 'Thank you for your vote!'
}
return JsonResponse(data)
else:
raise forms.ValidationError("You can vote only one time every 24 hours.")
else:
return HttpResponse(400, 'Invalid form')
现在我看得很清楚。我认为我需要将这个“votescoresubmitted”添加到用户类中,并使它在某种程度上对每个问题都是唯一的。但我想不出该如何处理这个问题。我将非常感谢你的帮助
多谢各位
编辑:
我与之斗争,我提出了额外的模型,应该存储有关投票的信息。现在,我的代码如下所示: models.py:
from django.db import models
from django.contrib.auth.models import User
class Question(models.Model):
question = models.CharField(max_length=300)
answered = models.BooleanField(default=False)
created = models.DateTimeField(auto_now_add=True)
datecompleted = models.DateTimeField(null=True, blank=True)
user = models.ForeignKey(User, on_delete=models.CASCADE)
def __str__(self):
return self.question
class Answer(models.Model):
question_id = models.ForeignKey(Question, on_delete=models.CASCADE, blank=False, null=True)
answer = models.TextField(max_length=1000)
created = models.DateTimeField(auto_now_add=True)
user = models.ForeignKey(User, on_delete=models.CASCADE)
def __str__(self):
return self.answer
class VoteQuestion(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
question_id = models.ForeignKey(Question, on_delete=models.CASCADE, blank=False, null=True)
votesubmitted = models.DateTimeField(null=True, blank=True)
votesscore = models.IntegerField(default='0')
amountofvotes = models.IntegerField(default='0')
views.py:
@login_required()
def questionvoteup(request, question_pk):
votequestion = get_object_or_404(VoteQuestion, pk=question_pk, user=request.user)
current_time = timezone.now()
if request.is_ajax() and request.method == "POST":
if not votequestion.votesubmitted or current_time > votequestion.votesubmitted + timedelta(days=1):
votequestion.votesscore += 1
votequestion.amountofvotes += 1
votequestion.votesubmitted = current_time
votequestion.save()
msg = "Thank you for your vote!"
else:
msg = "You can vote only one time every 24 hours."
data = {"msg": msg}
return JsonResponse(data)
else:
return HttpResponse(400, 'Invalid form')
和home.html(我在其中触发投票):
<ul>
{% for question in allquestionswithanswers %}
<li>
{{ question }} Score: {{ VoteQuestion.votesscore }} {{ question.user }}
<br><br>
<form class='my-ajax-form' method='POST' action='' data-url="{% url 'questionvoteup' question.id %}" >
{% csrf_token %}
<button type='submit'>UP</button>
</form>
{% for answer in question.answer_set.all %}
{{ answer }}<br>
{% endfor %}
</li>
{% endfor %}
</ul>
然而,在我点击“向上”后,我得到了错误:
Page not found at /viewquestion/6/voteup
No VoteQuestion matches the given query.
有几种方法可以做到这一点:
第一种方法是创建一个投票对象,其中包含相关字段user和question(多对一关系^{} )。这样做几乎总是比较容易
第二种方法是,向用户模型添加一个自定义字段,以跟踪该用户的投票历史。见extending Django’s default User
也许,在你看来,不要
ValidationError
也要传达一个信息:以及您的
VoteQuestion
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