Django基礎6--丟擲404異常
阿新 • • 發佈：2020-08-29
1.丟擲404錯誤
- 當內容不存在時，需要返回404
- 回到
views.py,改寫project_list
from django.http import HttpResponse, Http404 from django.shortcuts import render from .models import ProjectInfo # Create your views here. def home(request): project_list = ProjectInfo.objects.order_by('add_data')[:5] context = {'project_list': project_list} return render(request, 'autoapi/home.html', context) def project_list(request, project_id): try: project = ProjectInfo.objects.get(pk=project_id) context = {'project': project} except ProjectInfo.DoesNotExist: raise Http404('project list dose not exist') return render(request, 'autoapi/project.html', context) def register(request): return HttpResponse('You\'re looking at the register page')
- 回到
url.py改寫一下,project_list
from django.urls import path
from . import views
urlpatterns = [
path('home/', views.home, name='index'),
path('<int:project_id>/', views.project_list, name='project list'),
path('register/', views.register, name='register'),
]
- 在/AutoPlatform/autoapi/templates下新建一個
project.html檔案
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>AutoPlarform Home</title>
</head>
<body>
{{ project }}
</body>
</html>
- 來先看下全面的列表
- 資料中只有4個列表，那麼如果輸入id 為5的話，按照上面的程式碼邏輯應該就會丟擲404異常的錯誤了
- 來先看看id = 1
- 再看看id = 4
- 邊界值都看過了，那麼現在我們來輸入一個不存在資料的id,測試一下是否會丟擲404的異常
- 丟擲了project list dose not exist的異常
2.快捷函式： get_object_or_404()
Django還提供了一個快捷的函式來實現上面的功能
- 現在來再改寫一個views.py
# 作者：伊洛Yiluo 公眾號：伊洛的小屋
# 個人主頁：https://yiluotalk.com/
# 部落格園：https://www.cnblogs.com/yiluotalk/
from django.http import HttpResponse
from django.shortcuts import get_object_or_404, render
from .models import ProjectInfo
# Create your views here.
def home(request):
project_list = ProjectInfo.objects.order_by('add_data')[:5]
context = {'project_list': project_list}
return render(request, 'autoapi/home.html', context)
def project_list(request, project_id):
project = get_object_or_404(ProjectInfo, pk=project_id)
context = {'project': project}
return render(request, 'autoapi/project.html', context)
def register(request):
return HttpResponse('You\'re looking at the register page')
- 開啟一個存在的id
- 開啟一個不存在的id
- 這樣就簡化了一開始的過程，看上去更加的簡潔，而且會降低模型層和檢視層的耦合性