[django实践]投票app

code: https://github.com/lannyMa/toupiao

polls app介绍

这个例子来源于django官网,恰好2.x版本有中文版. https://docs.djangoproject.com/zh-hans/2.0/intro/tutorial01/

功能介绍

首页
投票
投票结果页

从首页点选项,进入投票(detail)页, 选择-vote(result),跳转到投票页重新投票

代码里值得学习的

1.取出关联表中的数据

detail.html

<h1>{{ question.question_text }}</h1>

<ul>

{% for choice in question.choice_set.all %}

    <li>{{ choice.choice_text }}</li>

{% endfor %}

</ul>

2: url的redirect和reverse

from django.http import HttpResponseRedirect

from django.shortcuts import render, get_object_or_404

from app01.models import Question, Choice

from django.urls import reverse

path('specifics/<int:question_id>/', views.detail, name='detail'),

<li><a href="{% url 'detail' question.id %}">{{ question.question_text }}</a></li>

return HttpResponseRedirect(reverse('app02:results', args=(question.id,)))

取出所有和取出某一个

https://docs.djangoproject.com/zh-hans/2.0/intro/tutorial04/

关于时间

class Question(models.Model):

    question_text = models.CharField(max_length=50)

    pub_date = models.DateTimeField(timezone.now())

    def was_published_recently(self):

        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)

    def __str__(self):

        return self.question_text

class Choice(models.Model):

    question_text = models.ForeignKey(Question, on_delete=models.CASCADE)

    choice_text = models.CharField(max_length=50)

    votes = models.IntegerField(default=0)

    def __str__(self):

        return self.choice_text

>>> from django.utils import timezone

>>> q = Question(question_text="What's new?", pub_date=timezone.now())

关于get_object_or_404

https://docs.djangoproject.com/zh-hans/2.0/intro/tutorial03/

detail

from django.http import Http404

from django.shortcuts import render

from .models import Question

# ...

def detail(request, question_id):

    try:

        question = Question.objects.get(pk=question_id)

    except Question.DoesNotExist:

        raise Http404("Question does not exist")

    return render(request, 'polls/detail.html', {'question': question})

from django.shortcuts import get_object_or_404, render

from .models import Question

# ...

def detail(request, question_id):

    question = get_object_or_404(Question, pk=question_id)

    return render(request, 'polls/detail.html', {'question': question})

巴特西

[django实践]投票app

polls app介绍

代码里值得学习的

1.取出关联表中的数据

2: url的redirect和reverse

取出所有和取出某一个

关于时间

关于get_object_or_404

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