python - Django:模型表单 "object has no attribute ' clean_data'"

Question

我正在尝试为我的一门类(class)制作搜索表单。表格的型号是:

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"]

我正在使用的 View 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'

我不知道发生了什么，有人可以帮助我吗？谢谢!

Answer 1

由于某种原因，您在检查 is_valid() 后重新实例化了表单。表单仅在调用 is_valid() 时才获得 cleaned_data 属性，而您还没有在这个新的第二个实例上调用它。

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