Python Django刪除當前對象

Question

我在/ notes/get/1 /中，其中id = 1，並且我在note.html中創建了一個「Delete Note」鏈接。我需要它從數據庫和應用程序中刪除當前的註釋並重定向到/ notes/all。你可以幫我用def delete中的代碼嗎？

models.py：

class Note(models.Model): 
    title = models.CharField(max_length=200) 
    body = models.TextField() 
    cr_date = models.DateTimeField(auto_now_add=True) 

urls.py：

urlpatterns = patterns('', 

    url(r'^all/$', 'note.views.notes'), 
    url(r'^get/(?P<note_id>\d+)/$', 'note.views.note'), # 
    url(r'^language/(?P<language>[a-z\-]+)/$', 'note.views.language'), # 
    url(r'^create/$', 'note.views.create'), 
    url(r'^delete/$', 'note.views.delete'), <-------------------------- 
    url(r'^search/$', 'note.views.search_titles'), 
) 

views.py：

def delete(??????): 
    ????? <------------------------------------------- 
    return HttpResponseRedirect('/notes/all') 

Answer 1

from django.shortcuts import get_object_or_404 
from django.core.urlresolvers import reverse 


def delete(request, id): 
    note = get_object_or_404(Note, pk=id).delete() 
    return HttpResponseRedirect(reverse('notes.views.notes')) 

而且在urls.py

url(r'^delete/(?P<id>\d+)/$','project.app.views.delete'), 

請確保在刪除對象之前檢查用戶權限，可以使用@permission_required修飾符https://docs.djangoproject.com/en/1.5/topics/auth/default/#the-permission-required-decorator。如果您沒有檢查，用戶可以輕鬆刪除所有筆記。

通常，使用POST或DELETE請求而不是GET來從數據庫中刪除對象是一個好主意。想象一下，google-bot抓取您的網站並訪問notes/delete/2。

Answer 2

你必須把一個變量插入網址：

url(r'^delete/(?P<id>\d+)/$', 'note.views.delete') 

然後查看功能應該是這樣的：

def delete(request, id): 
    obj = Note.objects.get(pk=id) 
    obj.delete() 
    return HttpResponseRedirect('/notes/all') 

Answer 3

這是一個有點微的優化，但已經給出的答案會採取兩個數據庫調用，而你可以在一個：

Note.objects.filter(pk=id).delete() 

Answer 4

我認爲下面的代碼將解決prob LEM

Urls.py

url(r'^delete/(?P<id>\d+)/$','project.app.views.delete'), 

Views.py

from django.shortcuts import get_object_or_404 
from django.http import HttpResponseRedirect 

def delete(request, id): 
    note = get_object_or_404(Note, pk=id).delete() 
    return HttpResponseRedirect('/notes/all') 

Answer 5

你不需要因爲Django帶有這些手工編寫這些意見，他們被稱爲generic views。

例如，貢獻刪除視圖執行以下操作：

1. 要求用戶確認他們真的要刪除的對象。
2. 刪除對象。
3. 重定向到視圖。

這裏是你將如何使用它：

在你views.py：

from django.views.generic.edit import DeleteView # this is the generic view 
from django.core.urlresolvers import reverse_lazy 
from yourapp.models import Note 

class NoteDelete(DeleteView): 
    model = Note 
    success_url = reverse_lazy('all_notes') # This is where this view will 
              # redirect the user 
    template_name = 'delete_note.html' 

創建delete_note.html模板，它只有這個：

Hey, are you sure you want to delete {{ object.title }}? 
<form method="post"> 
    {% csrf_token %} 
    <button type="submit" class="btn btn-danger">Yeap, I'm sure.</button> 
</form> 

在你urls.py：

urlpatterns = patterns('', 

    url(r'^all/$', 'note.views.notes', name='all_notes'), # Giving your urls a name 
                 # makes it easier to refer 
                 # to them later 
    url(r'^get/(?P<note_id>\d+)/$', 'note.views.note'), # 
    url(r'^language/(?P<language>[a-z\-]+)/$', 'note.views.language'), # 
    url(r'^create/$', 'note.views.create'), 
    url(r'^delete/(?P<pk>\d+)/$', 'note.views.NoteDelete.as_view()', name="delete_note"), 
    url(r'^search/$', 'note.views.search_titles'), 
) 

現在，假設你要顯示的鏈接刪除一張紙條，說你index.html：

Here are all my notes: 
<ul> 
{% for note in all_notes %} 
    <li>{{ note.title }} - <a href="{% url 'delete_note' pk=note.pk %}">Delete</a></li> 
{% endfor %} 
</ul>