Django part4

怼烎@ 2021-10-18 15:54 264阅读 0赞

### Django part4 ###

*  polls part4
 *   *  polls/detail.html
     *  polls/views.py
     *  polls/results.html
     *  参考博客

# polls part4 #

## polls/detail.html ##

进一步完善detail

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>polls 详情页</title>
    </head>
    <body>
    <h1>{
       { question.question_text }}</h1>
    
    {% if error_message %}<p><strong>{
       { error_message }}</strong></p>{% endif %}
    
    <form action="{% url 'polls:vote' question.id %}" method="post">
    {% csrf_token %}
    
    
    {% for choice in question.choice_set.all %}
        <input type="radio" name="choice" id="choice{ { forloop.counter }}" value="{ { choice.id }}">
        <label for="choice{ { forloop.counter }}">{
       { choice.choice_text }}</label><br>
        
    {% endfor %}
    <input type="submit" value="Vote">
    </form>
    </body>
    </html>

## polls/views.py ##

[进一步完善views.py][views.py]

from django.shortcuts import render
    from django.http import HttpResponse, HttpResponseRedirect
    from django.http import Http404
    from .models import Question
    from django.template import loader
    from django.shortcuts import get_object_or_404
    from .models import Choice
    from django.urls import reverse
    # Create your views here.
    # Django模板使用 https://docs.djangoproject.com/en/2.2/topics/templates/
    
    
    def index(request):
        latest_question_list = Question.objects.order_by('-pub_date')[:5]
        template = loader.get_template('polls/index.html')
        context = { 
            'latest_question_list': latest_question_list,
        }
        return HttpResponse(template.render(context, request))
    
    
    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})
    
    
    def results(request, question_id):
        question = get_object_or_404(Question, pk=question_id)
        return render(request, 'polls/results.html', { 'question': question})
    
    
    def vote(request, question_id):
        question = get_object_or_404(Question, pk=question_id)
        # get_object_or_404 是Django 一种简单的写法，没找到指定资源，会抛出404异常
        try:
            selected_choice = question.choice_set.get(pk=request.POST['choice'])
              # request.POST['choice'] 类似字典获取from表单post 传递数据，返回值会string类型
        except (KeyError, Choice.DoesNotExist):
            # Redisplay the question voting form.
            return render(request, 'polls/detail.html', { 
                'question': question,
                'error_message': "You didn't select a choice.",
            })
        else:
            selected_choice.votes += 1
            selected_choice.save()
            # Always return an HttpResponseRedirect after successfully dealing
            # with POST data. This prevents data from being posted twice if a
            # user hits the Back button.
            return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

## polls/results.html ##

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>polls 结果</title>
    </head>
    <body>
    <h1>{
       { question.question_text }}</h1>
    
    <ul>
    {% for choice in question.choice_set.all %}
        <li>{
       { choice.choice_text }} -- {
       { choice.votes }} vote{
       { choice.votes|pluralize }}</li>
    {% endfor %}
    </ul>
    
    <a href="{% url 'polls:detail' question.id %}">Vote again?</a>
    </body>
    </html>

## 参考博客 ##

[Django表单][Django]  
[Django传值][Django 1]  
[用python专业版创建Django项目][python_Django]  
[Django创建一个应用项目][Django 2]  
[Django app2][]  
[Django part3][]

[views.py]: http://xn--views-fg1h226b5wlhx8a2g0f.py
[Django]: https://blog.csdn.net/qq_41146650/article/details/93660292
[Django 1]: https://blog.csdn.net/qq_41146650/article/details/93656232
[python_Django]: https://blog.csdn.net/qq_41146650/article/details/93654205
[Django 2]: https://blog.csdn.net/qq_41146650/article/details/99232683
[Django app2]: https://blog.csdn.net/qq_41146650/article/details/99238636
[Django part3]: https://blog.csdn.net/qq_41146650/article/details/99290254