python - Django: View 中的冲突行为

Question

我有一个 wiki 应用程序，具有存储、保存、编辑功能。当我创建一个 wiki 页面时，它会被完美存储，并且 view_page View 在从数据库获取数据并将其显示在浏览器中时没有任何问题。但是当我单击编辑按钮并且它进入 edit_page View 时，问题就出现了，该 View 没有获取数据。它获取标题，但不获取内容并引发 Article.DoesNotExist 异常。

这是两个 View :

def view_page(request):
    if "title" in request.GET and request.GET["title"]:
        article_name = request.GET["title"]
        try:
            article = Article.objects.get(title=article_name)
        except Article.DoesNotExist:
            return render_to_response("search_page.html", {"error": "page doesn't exist"})
        return render_to_response("view_page.html", {"title": article.title, "content": article.content})
    else:
        return render_to_response("search_page.html", {"error": "page doesn't exist."})


def edit_page(request):
    c = {}
    c.update(csrf(request))
    if "title" in request.GET:
        article_name = request.GET["title"]
        try:
            article = Article.objects.get(title=article_name)
            content = article.content
        except Article.DoesNotExist:
            content = ""

        c["title"] = article_name
        c["content"] = content
        return render_to_response("edit_page.html", c)

        def save_page(request):
            if request.method == 'POST':

                if "title" in request.POST and "content" in request.POST and request.POST["title"]:

                    c = {}
                    c.update(csrf(request))
                    try:
                        article = Article.objects.get(title=request.POST["title"])
                        article.content = request.POST["content"]
                    except Article.DoesNotExist:
                        article = Article(request.POST["title"], request.POST["content"])
                        article.save()
                        return HttpResponseRedirect("/view_page/?title="+request.POST["title"])
                    return render_to_response("create_page.html", c)

这是我的模型:

class Article(models.Model):
    title = models.CharField(primary_key=True, unique=True, max_length=20)
    content = models.TextField(blank=True)

Answer 1

看起来问题可能出在 save_page() View 的 try-catch 部分的 try block 中，请尝试以下操作:

def save_page(request):
    if request.method == 'POST':

        if "title" in request.POST and "content" in request.POST and request.POST["title"]:

            c = {}
            c.update(csrf(request))
            try:
                article = Article.objects.get(title=request.POST["title"])
                article.content = request.POST["content"]
                article.save()
            except Article.DoesNotExist:
                article = Article(request.POST["title"], request.POST["content"])
                article.save()
                return HttpResponseRedirect("/view_page/?title="+request.POST["title"])
            return render_to_response("create_page.html", c)

以前，如果文章以前存在，则在内容更新后不会保存该文章。

编辑:您可以尝试使用以下内容调试 edit_page() View :

def edit_page(request):
    c = {}
    c.update(csrf(request))
    if "title" in request.GET:
        article_name = request.GET["title"]
        try:
            article = Article.objects.get(title=article_name)
            content = article.content
            print "article: %s retrieved from database" % article_name
        except Article.DoesNotExist:
            print "article: %s not found in database" % article_name
            content = ""

        c["title"] = article_name
        c["content"] = content
        return render_to_response("edit_page.html", c)

如果您使用./manage.py runserver，调试消息应该与http请求混合出现，如果数据库正确检索文章，则模板一定有问题。