Django:模型表单“对象没有属性‘cleaned_data’"

问题描述

我正在尝试为我的一个班级制作一个搜索表单.表单的模型为:

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

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"]

我使用的视图是:

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))

表单显示正常，但是当我提交时出现错误:'SearchForm' object has no attribute 'cleaned_data'

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

我不知道发生了什么，有人可以帮帮我吗?谢谢！

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

推荐答案

出于某种原因，您在检查 is_valid() 后重新实例化了表单.表单只有在 is_valid() 被调用时才获得一个 cleaned_data 属性，而你没有在这个新的第二个实例上调用它.

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.

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

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

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