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

{{ question.question_text }}

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 reversepath(&＃39;specifics//&＃39;, views.detail, name&＃61;&＃39;detail&＃39;),

return HttpResponseRedirect(reverse(&＃39;app02:results&＃39;, args&＃61;(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 &＃61; models.CharField(max_length&＃61;50)pub_date &＃61; models.DateTimeField(timezone.now())def was_published_recently(self):return self.pub_date >&＃61; timezone.now() - datetime.timedelta(days&＃61;1)def __str__(self):return self.question_textclass Choice(models.Model):question_text &＃61; models.ForeignKey(Question, on_delete&＃61;models.CASCADE)choice_text &＃61; models.CharField(max_length&＃61;50)votes &＃61; models.IntegerField(default&＃61;0)def __str__(self):return self.choice_text


>>> from django.utils import timezone
>>> q &＃61; Question(question_text&＃61;"What&＃39;s new?", pub_date&＃61;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 renderfrom .models import Question
# ...
def detail(request, question_id):try:question &＃61; Question.objects.get(pk&＃61;question_id)except Question.DoesNotExist:raise Http404("Question does not exist")return render(request, &＃39;polls/detail.html&＃39;, {&＃39;question&＃39;: question})

from django.shortcuts import get_object_or_404, renderfrom .models import Question
# ...
def detail(request, question_id):question &＃61; get_object_or_404(Question, pk&＃61;question_id)return render(request, &＃39;polls/detail.html&＃39;, {&＃39;question&＃39;: question})