当渲染到模板时，如何检查用户与模型的关系 - Django [英] How to check a user's relation to a model when rendering to a template - Django

问题描述

例如，stackoverflow问题的投票功能。

For example, the voting feature for a stackoverflow question.

if user has voted:
    highlight arrow

如果模型设置如下：

class Question(models.Model):
    #....
    voters = models.ManyToManyField(User)

最好做一些像

views.py

class DisplayQuestion:
    def __init__(self, question, user):
        self.__dict__ = question.__dict__.copy()
        self.has_voted = user in question.voters.all()

def show_question(request, question_pk):
    question = Question.objects.get(pk=question_pk)
    render('question.html', {'question':DisplayQuestion(question, request.user)})

或将其作为另一个变量传递？ p>

or pass it as another variable?

def show_question(request, question_pk):
    question = Question.objects.get(pk=question_pk)
    render('question.html', {'question':question, 
                             'has_voted':user in question.voters.all()})

这似乎不太理想。您可能想要显示一大堆问题，并且不会为每个问题通过 has_voted 。

或是通过ajax（）调用检查的最佳方法？

or is the best way to check via an ajax() call?

推荐答案

最简单的方法是在发送到模板之前注释一个属性。

The simplest way is to just annotate an attribute before sending to the template.

question.has_voted = user in question.voters.all()

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