提交表单时，Django is_valid() 会抛出 ValueError 。不知道为什么

发布于 2024-10-25 02:04:22 字数 1995 浏览 3 评论 0原文

以下代码基于模型 Post 创建一个表单。我面临的问题是，如果我删除 if post_form.is_valid():，表单永远不会验证，并给出ValueError，数据未验证查看。

但是，如果我保留如下所示的代码，即保留 if post_form.is_valid(): 检查，那么它总是失败并执行 else 块。

我试图在我的模型中保存用户，它是 Django Auth 的外键，结果发现我什至无法克服这个 vlaidation 错误。

任何帮助将不胜感激。谢谢。

#----------------------------Model-------------------------------------- 
class Post (models.Model): 
    name = models.CharField(max_length=1000, help_text="required, name of the post") 
    user = models.ForeignKey(User, unique=False, help_text="user this post belongs to") 

    def __unicode__(self): 
        return self.name 

class PostForm(ModelForm): 
    class Meta: 
            model = Post 
#----------------------------./Model--------------------------------------

#----------------------------View-------------------------------------- 
@login_required 
def create_post (request): 
    if request.method == 'POST': 
        post_form = PostForm(request.POST) 
        if post_form.is_valid(): 
            post.save() 
            return render_to_response('home.html') 
        else: 
            return HttpResponse('not working') 
    else: 
        post_form = PostForm() 
        return render_to_response('create.html', {'post_form':post_form }) 
#----------------------------./View--------------------------------------

#----------------------------./Template--------------------------------------
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>home</title>
</head>
<body>
<form method="POST" action='.'>{% csrf_token %}
    <p>{{post_form.name.label_tag}}</p>
    <p>{{post_form.name}}</p>
        <p><input type="submit" value="Submit"/></p>
</form>
</body>
</html>
#----------------------------./Template--------------------------------------

原文

The following code creates a form based on a model, Post. Problem I am facing is that the form never validates and gives ValueError that data did not validate if I remove the if post_form.is_valid(): check.

However, if I keep the code as shown below, that is, I keep the if post_form.is_valid(): check, then it always fails and the else block is executed.

I was trying to save the User, which is a ForeignKey to Django's Auth, in my model and it turns out I cannot even get past this vlaidation error.

Any help will be appreciated. Thanks.

#----------------------------Model-------------------------------------- 
class Post (models.Model): 
    name = models.CharField(max_length=1000, help_text="required, name of the post") 
    user = models.ForeignKey(User, unique=False, help_text="user this post belongs to") 

    def __unicode__(self): 
        return self.name 

class PostForm(ModelForm): 
    class Meta: 
            model = Post 
#----------------------------./Model--------------------------------------

#----------------------------View-------------------------------------- 
@login_required 
def create_post (request): 
    if request.method == 'POST': 
        post_form = PostForm(request.POST) 
        if post_form.is_valid(): 
            post.save() 
            return render_to_response('home.html') 
        else: 
            return HttpResponse('not working') 
    else: 
        post_form = PostForm() 
        return render_to_response('create.html', {'post_form':post_form }) 
#----------------------------./View--------------------------------------

#----------------------------./Template--------------------------------------
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>home</title>
</head>
<body>
<form method="POST" action='.'>{% csrf_token %}
    <p>{{post_form.name.label_tag}}</p>
    <p>{{post_form.name}}</p>
        <p><input type="submit" value="Submit"/></p>
</form>
</body>
</html>
#----------------------------./Template--------------------------------------

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倒数 2024-11-01 02:04:22

在您的另一篇文章中，您尝试自动插入 user 字段，这可能意味着您的模板中没有显示 user 字段。

如果您打算插入用户，请排除它。

class PostForm(ModelForm): 
    class Meta: 
            model = Post 
            exclude = ('user',) # exclude this

if request.method == 'POST': 
    post_form = PostForm(request.POST) 
    if post_form.is_valid(): 
        post = post.save(commit=False) 
        post.user = request.user
        post.save()  # now post has a user, and can actually be saved.
        return render_to_response('home.html')

In your other post, you were trying to automatically insert the user field, which probably means you don't have a user field displayed in the template.

Exclude it if you plan to insert the user anyways.

class PostForm(ModelForm): 
    class Meta: 
            model = Post 
            exclude = ('user',) # exclude this

if request.method == 'POST': 
    post_form = PostForm(request.POST) 
    if post_form.is_valid(): 
        post = post.save(commit=False) 
        post.user = request.user
        post.save()  # now post has a user, and can actually be saved.
        return render_to_response('home.html')

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