Question

我将使用表单向DBase添加记录。因此，当request.method ='Post'和form.is_valid时，我需要将数据写入数据库。我在views.py

中写了这个

def makepicturepost(request):
    form = PostForm2()
    print('View called')
    print('Request_method ' + request.method + ' Form.is_valid ' + str(form.is_valid()))

    if request.method == 'POST' and form.is_valid():
        author = form.author
        comment = form.comment
        picture = form.picture
        newpost = PicturePost(author=author, comment=comment, picture=picture)
        newpost.save()
        return HttpResponseRedirect('/')

    context = {
        "form": form
    }
    return render(request, "makepost.htm", context)

在调用form.is_valid（）之后应该检查表单验证，所以我在forms.py中写了一些验证方法

class PostForm2(forms.Form):
    author = forms.CharField(max_length=30, widget=forms.TextInput)
    comment = forms.CharField(max_length=1500, widget=forms.Textarea)
    picture = forms.ImageField()

    def clean_author(self):
        print('cleaned_author')
        author = self.cleaned_data.get('author')
        if not author:
            raise forms.ValidationError("Autor name shouldn't be blank")
        return author

    def clean_comment(self):
        print('cleaned_comment')
        comment = self.cleaned_data.get('comment')
        if not comment:
            raise forms.ValidationError("Write a pair of lines as a comment")
        return comment

    def clean_picture(self):
        print('cleaned_picture')
        picture = self.cleaned_data.get('picture')
        print(picture)
        return picture

我打算检查图片对象，找出如何检查它只是一个图像。但我的clean_field方法似乎根本没有调用。这就是我在控制台中所拥有的：

View called
Request_method POST Form.is_valid False
[13/Jun/2017 11:12:38] "POST /post/ HTTP/1.1" 200 788

正如我理解文档，他们应该运行，但他们没有。我哪里错了？

Answer 1

要实现这一目标，您必须考虑以下几点：

您的makepost.htm模板表单应包含enctype="multipart/form-data"
如Exprator所述，您需要获取帖子数据
您还需要获取request.FILES才能访问文件
您应该使用form.cleaned_data['field']

记住这些代码可以得到您想要的结果

def makepicturepost(request):
    if request.method == 'POST':
        form = PostForm2(request.POST, request.FILES)
        if form.is_valid():
            author = form.cleaned_data['author']
            comment = form.cleaned_data['comment']
            picture = form.cleaned_data['picture']
            newpost = PicturePost(author=author, comment=comment, picture=picture)
            newpost.save()
            return HttpResponseRedirect('/')
    else:
        form = PostForm2()

    context = {
            'form': form
        }
    return render(request, 'makepost.htm', context)

Answer 2

def makepicturepost(request):
    form = PostForm2(request.POST)
    print('View called')
    print('Request_method ' + request.method + ' Form.is_valid ' + str(form.is_valid()))

    if request.method == 'POST' and form.is_valid():
        author = form.author
        comment = form.comment
        picture = form.picture
        newpost = PicturePost(author=author, comment=comment, picture=picture)
        newpost.save()
        return HttpResponseRedirect('/')

    context = {
        "form": form
    }
    return render(request, "makepost.htm", context)

您没有使用帖子数据来检查PostForm2的干净方法

Answer 3

1）您需要使用POST数据初始化表单
2）您需要使用form.cleaned_data

def makepicturepost(request):
    form = PostForm2(request.POST)
    if request.method == 'POST' and form.is_valid():
        author = form.cleaned_data['author']
        comment = form.cleaned_data['comment']
        picture = form.cleaned_data['picture']
        newpost = PicturePost(author=author, comment=comment, picture=picture)
        newpost.save()
        return HttpResponseRedirect('/')

    context = {
        "form": form
    }
    return render(request, "makepost.htm", context)

更简单的方法是使用ModelForm并让表单在保存时为您创建一个新实例。

class PostForm2(forms.ModelForm):
    class Meta:
        model = PicturePost
        fields = ['author', 'comment', 'picture']
#  I've removed your clean methods as the the form does it for you
#  But the message may be different


def makepicturepost(request):
    form = PostForm2(request.POST)
    if request.method == 'POST' and form.is_valid():
        form.save()
        return HttpResponseRedirect('/')

    context = {
        "form": form
    }
    return render(request, "makepost.htm", context)

表单验证不起作用。如何调用clean_field方法

3 个答案: