django 查询集未显示准确结果（构建新闻应用程序）
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【中文标题】django 查询集未显示准确结果（构建新闻应用程序）【英文标题】：django queryset not showing accurate result (building a news app) 【发布时间】：2021-04-04 00:50:39 【问题描述】：我正在使用 django 创建一个新闻应用程序。它包括按日期搜索选项。当我选择日期（例如：29-11-2020）并单击提交时，它应该带我查看当天的新闻。当我尝试下面的代码而不是显示详细信息时，它给了我一个空白页。 视图.py
from django.shortcuts import render
from .models import *
from django.views.generic.detail import DetailView
from django.views.generic import ListView
def index(request):
return render(request,'newspaperapp/index.html')
class nowlist(ListView):
model = newsmodel_1
template_name = 'newspaperapp/index.html'
class newslist(DetailView):
model = newsmodel_1
template_name = 'newspaperapp/home.html'
context_object_name = 'newspaperapp'
# search by giving date in index and search date
class SearchView(ListView):
model = newsmodel_1
template_name = 'newspaperapp/search.html'
context_object_name = 'all_search_results'
def get_queryset(self):
result = super(SearchView, self).get_queryset()
query = self.request.GET.get('search')
if query:
postresult = newsmodel_1.objects.filter(date_published__contains=query)
result = postresult
else:
result = None
return result
urls.py
from django.urls import path
app_name = 'newspaperapp'
from .views import newslist,SearchView,nowlist
from newspaperapp import views
urlpatterns = [
path('',views.index,name='index'),
path('date/',nowlist.as_view(),name = "date"),
path('<int:pk>',newslist.as_view(),name = "home"),
path('results/', SearchView.as_view(), name='search'),
]
newspaperapp/home.html
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<p>Today's Paper</p>
newspaperapp.date_published
newspaperapp.category
</body>
newspaperapp/index.html
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<!-- this page has search option and different categories of news -->
<!-- to create search option we write views code and continue -->
<form class="form-inline my-2 my-lg-0" method="GET" action="% url 'newspaperapp:search' %">
<input class="form-control mr-sm-2" type="date" placeholder="Search" aria-label="Search"
name="search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
%for newspaperapp in object_list %
<li><a href="%url 'newspaperapp:home' newspaperapp.pk %">newspaperapp.title</a>
newspaperapp.date_published
%endfor%
</ul>
</body>
</html>
newspaperapp/search.html
% block content %
% for newspaperapp in all_search_results %
<h3><a href="%url 'newspaperapp:home' newspaperapp.pk %"></a></h3>
% empty %
<h2>No results found</h2>
% endfor %
% endblock %
【问题讨论】：
您的输入没有 name="search" 属性，因此它不会被发送，它会导致您的结果为 None （检查您的 if 条件） 【参考方案1】：Contain在sql中通常翻译为LIKE，通常用于在列中搜索指定的文本模式。
如果要过滤日期，可以将query 转换为日期时间对象，并使用gte 和lt 搜索特定日期范围内的对象strong> 查找。
from datetime import datetime, timedelta
class SearchView(ListView):
model = newsmodel_1
template_name = 'newspaperapp/search.html'
context_object_name = 'all_search_results'
def get_queryset(self):
result = super(SearchView, self).get_queryset()
query = self.request.GET.get('search')
# query is of type 'str', convert to datetime
start_day = datetime.fromisoformat(query)
end_day = start_day + timedelta(days=1)
if query:
postresult = newsmodel_1.objects.filter(
date_published__gte=start_day,
date_published__lt=end_day
)
result = postresult
else:
result = None
return result
注意：添加更多逻辑来处理query是None
【讨论】：
还是一样的结果。 @PadalaKavya 忘记了<a> 标签中的项目？ <h3><a href="%url 'newspaperapp:home' newspaperapp.pk %"> newspaperapp </a></h3>，也尝试打印postresult 以查看查询集是否正确传递
我其实想在点击搜索后直接进入详细信息页面，但上面的代码将我带到详细信息页面的链接。我该如何解决这个问题？请帮忙以上是关于django 查询集未显示准确结果（构建新闻应用程序）的主要内容，如果未能解决你的问题，请参考以下文章
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