Django：Model Form“对象没有属性”clean_data“” [英] Django: Model Form "object has no attribute 'cleaned_data'"

问题描述

我正在尝试为我的一个课程制作一个搜索表单。表单的模型是：

  from django import forms 
 from django.forms import CharField，ModelMultipleChoiceField，ModelChoiceField 
 from books.models import Book，作者，类别
 
 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：

<$来自django.shortcuts的p $ p> import render_to_response，redirect，get_object_or_404
from django.template import RequestContext
from books.models import Book，作者
from books.forms import bookForm，SearchForm
from users.models import User

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


表单显示正常，但当我提交它时，我收到一个错误：'SearchForm'对象没有属性'clean_data'

我是不知道发生了什么，有人可以帮我吗？谢谢！

解决方案

由于某种原因，您在检查 is_valid（）后重新实例化表单）。当 is_valid（）已被调用时，窗体只得到一个 clean_data 属性，而您尚未在此新的，第二个例子。

只需摆脱第二个 form = SearchForm（request.POST），所有应该好吧。

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"]

And the view I'm using is:

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'

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

解决方案

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.

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

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