Question

我正在尝试为我的一个班级制作一个搜索表单。表格的模型是：

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))

表单显示正常，但是当我提交时，我收到错误：'SearchForm' object has no attribute 'cleaned_data'

我不确定发生了什么事，有人可以帮助我吗？谢谢！

Answer 1

出于某种原因，您在检查is_valid()后重新实例化表单。表单仅在调用cleaned_data时获得is_valid()属性，并且您尚未在此新的第二个实例上调用它。

摆脱第二个form = SearchForm(request.POST)，一切都应该好。

Answer 2

我会写这样的代码：

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))

非常像documentation。

Answer 3

有时，如果我们忘记了

return self.cleaned_data

在django表单的清除功能中，虽然form.is_valid()将返回True，但我们不会有任何数据。

Django：模型表单“对象没有属性'cleaning_data'”

3 个答案: