Django:模型形式“对象没有属性‘cleaned_data’”

I am trying to make a search form for one of my classes. The model of the form is:

我正在为我的一个班级做一个搜索表格。表格的模型为:

from django import forms
from django.forms import CharField, ModelMultipleChoiceField, ModelChoiceField
from books.models import Book, Author, Category

class SearchForm(forms.ModelForm):
    authors = ModelMultipleChoiceField(queryset=Author.objects.all(),required=False)    
    category = ModelChoiceField (queryset=Category.objects.all(),required=False)
    class Meta:
        model = Book
        fields = ["title"]

And the view I'm using is:

我使用的观点是:

from django.shortcuts import render_to_response, redirect, get_object_or_404
from django.template import RequestContext
from books.models import Book,Author
from books.forms import BookForm, SearchForm
from users.models import User

def search_book(request):
    if request.method == "POST":
        form = SearchForm(request.POST)
        if form.is_valid():
            form = SearchForm(request.POST)
            stitle = form.cleaned_data['title']
            sauthor = form.cleaned_data['author']
            scategory = form.cleaned_data['category']
    else:
        form = SearchForm()
    return render_to_response("books/create.html", {
        "form": form,
    }, context_instance=RequestContext(request))

The form shows up fine, but when I submit it I get an error: 'SearchForm' object has no attribute 'cleaned_data'

表单显示的很好，但是当我提交它时，我得到一个错误:“SearchForm”对象没有属性“cleaned_data”

I'm not sure what's going on, can someone help me out? Thanks!

我不知道发生了什么事，有人能帮我一下吗?谢谢!

3 个解决方案

#1

121

For some reason, you're re-instantiating the form after you check is_valid(). Forms only get a cleaned_data attribute when is_valid() has been called, and you haven't called it on this new, second instance.

出于某种原因，您在检查is_valid()之后重新实例化表单。当is_valid()被调用时，表单只获得一个cleaned_data属性，而您还没有在这个新的、第二个实例上调用它。

Just get rid of the second form = SearchForm(request.POST) and all should be well.

只要去掉第二个form = SearchForm(request.POST)就可以了。

#2

I would write the code like this:

我会这样写代码:

def search_book(request):
    form = SearchForm(request.POST or None)
    if request.method == "POST" and form.is_valid():
        stitle = form.cleaned_data['title']
        sauthor = form.cleaned_data['author']
        scategory = form.cleaned_data['category']
        return HttpResponseRedirect('/thanks/')
    return render_to_response("books/create.html", {
        "form": form,
    }, context_instance=RequestContext(request))

Pretty much like the documentation.

很像文档。

#3

At times, if we forget the

有时，如果我们忘记了

return self.cleaned_data

in the clean function of django forms, we will not have any data though the form.is_valid() will return True.

在django表单的clean函数中，我们没有任何数据，但是form.is_valid()将返回True。

#1

121