如何使用Django中对象列表中的帖子数据调用对象?

时间:2014-01-09 21:19:08

标签: django list post python-2.7 filter

Django 1.6 / Python 2.7。

我正在制作一个应用程序,其中用户对来自一组公民对象的“公民”进行投票,并且该公民成为最佳公民。如果公民有3个或更多“投票”,则他们才有资格成为“最佳公民”。我在管理员中添加公民和投票,所以我们不会在这里处理。这些是我的模特:

best_app / models.py

from django.db import models

class Citizen(models.Model):
    name = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)
    can_best = models.BooleanField(False)

    def __unicode__(self):
        return self.name

class Best_Citizen(models.Model):
    name = models.CharField(max_length=200)
    citizen = models.OneToOneField(Citizen)

    def __unicode__(self):
        return self.name

我在choose_best视图中遇到问题,选择的公民应该通过主键缩小。我不能在对象列表上调用get(),但在我看来,我应该做什么。我也尝试过滤缩小视图,语法不正确。

from best_app.models import Citizen, Best_Citizen
from django.shortcuts import render, get_object_or_404, get_list_or_404

def index(request):

    citizens = Citizen.objects.all()
 #   citizens = get_list_or_404(Citizen)
    for citizen in citizens: 
        if citizen.votes >= 3:
            citizen.can_best = True
            citizen.save()

    return render(request, 'best_app/index.html', {'citizens':citizens})

def detail(request, citizen_id):

    try:
        citizen = Citizen.objects.get(pk=citizen_id)
    except Citizen.DoesNotExist:
        print "raise Http404"
    return render(request, 'best_app/detail.html', {'citizen':citizen})
 #   return HttpResponse("You're looking at poll %s." % citizen.name)

def choose_best(request):

    best_candidates = get_list_or_404(Citizen, can_best=True)       # narrow down the candidates for best citizen to those with >= 3 votes

    if request.method == 'POST':

        try:
            selected_choice = best_candidates.get(pk=request.POST['choice'])
        except (KeyError, Citizen.DoesNotExist):

            return render(request, 'index.html')
        else:   
            Best_Citizen.objects.all().delete()                 # Current best citizen is deleted to make way for new best citizen
            new_best = Best_Citizen(citizen=selected_choice)    
            new_best.save()
            return render(request, 'best_app/index.html', {'new_best':new_best})

    else:
        return render(request, 'best_app/choose_best.html', {'best_candidates':best_candidates})        

我收到错误消息“List属性没有属性获取”。如果过滤并且不起作用,我如何通过主键选择所选的“最佳候选人”? 谢谢!

1 个答案:

答案 0 :(得分:0)

documentation for get_list_or_404状态时,它会将其结果转换为列表。如果你想进一步过滤它是不好的:所以不要使用那个快捷方式。

 best_candidates = Citizen.objects.filter(can_best=True)