Question

这是我得到的错误：视图myapp.views.view_page没有返回HttpResponse对象

有谁能看到我在这里做错了什么？因为我正在返回一个HttpResponseRedirect，所以我似乎无法弄清楚为什么我会得到该异常。

views.py

from myapp.models import Page
from django.shortcuts import render_to_response
from django.http import HttpResponseRedirect
from django.template import Template, RequestContext
from django.core.context_processors import csrf

def view_page(request, page_name):
        try:
                    page = Page.objects.get(pk=page_name)
        except Page.DoesNotExist:
                    return render_to_response("create.html", {"page_name" :page_name},context_instance=RequestContext(request))

                    content=page.content
                    return render_to_response("view.html", {"page_name" :page_name , "content" :content},context_instance=RequestContext(request))

def edit_page(request, page_name):
        try:
                    page = Page.objects.get(pk=page_name)
                    content=page.content
        except Page.DoesNotExist:
                    content = ""
                    return render_to_response("edit.html", {"page_name" :page_name, "content" :content},context_instance=RequestContext(request))         

def save_page(request, page_name):
                content = request.POST["content"]
        try:
                    page = Page.objects.get(pk=page_name)
                    page.content=content

        except Page.DoesNotExist:
                    page = Page(name=page_name, content=content)
                    page.save()
                    return HttpResponseRedirect("/myproject/" + page_name + "/")

Answer 1

当没有引发异常时，你有一条没有返回任何内容的执行路径。你所拥有的缩进是将两个return语句放在except块中;实际上永远不会执行第二次回报：

from django.shortcuts import render

def view_page(request, page_name):
    try:
        page = Page.objects.get(pk=page_name)
    except Page.DoesNotExist:
        return render(request,"create.html",{"page_name" :page_name})

    content=page.content
    return render(request,"view.html",{"page_name":page_name,"content":content})

您还需要对其他方法也这样做：

def edit_page(request, page_name):

    try:
        page = Page.objects.get(pk=page_name)
        content=page.content
    except Page.DoesNotExist:
        content = ""
    return render(request,"edit.html", {"page_name":page_name,"content":content})

def save_page(request, page_name):

    content = request.POST["content"]
    page,_ = Page.objects.get_or_create(pk=page_name)
    page.content = content
    page.save()
    return HttpResponseRedirect("/myproject/" + page_name + "/")

我使用的render shortcut自动包含RequestContext。

Answer 2

你的缩进是完全错误的。我不知道你是否已经解决了你的问题，但正如我在你提出的一分钟后在第一条评论中说的那样，你应该做到以下几点：

评论除一种方法之外的所有内容
例如，保留方法view_page
仔细查看试用
请考虑以下事项：我是否在所有情况下都返回了某些内容？
- 我是否在try条款中返回了一些内容？
- 我是否在except条款中返回了一些内容？
- 我的缩进可能错误？

如果你密切关注你的代码，你会发现它吗？：）

Answer 3

您的view_page函数是

def view_page(request, page_name):
    try:
        page = Page.objects.get(pk=page_name)
        content=page.content
    except Page.DoesNotExist:
        content=None
    return render_to_response("view.html",{"page_name": page_name,
                                           "content": content},
                              context_instance=RequestContext(request))

类似地，编辑和保存方法是

def edit_page(request, page_name):
    try:
        page = Page.objects.get(pk=page_name)
        content=page.content
    except Page.DoesNotExist:
        content = ""
    return render_to_response("edit.html", {"page_name": page_name,
                                            "content": content},
                              context_instance=RequestContext(request))         

def save_page(request, page_name):
    content = request.POST["content"]
    try:
        page = Page.objects.get(pk=page_name)
        page.content=content
    except Page.DoesNotExist:
        page = Page(name=page_name, content=content)
    page.save()
    return HttpResponseRedirect("/myproject/" + page_name + "/")

该视图未返回HttpResponse对象

3 个答案: