Python Django：模型表单“对象没有属性‘cleaned_data’”
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Django: Model Form "object has no attribute 'cleaned_data'"
提问by Joseph
I am trying to make a search form for one of my classes. The model of the form is:
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"]
And the view I'm using is:
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))
The form shows up fine, but when I submit it I get an error: 'SearchForm' object has no attribute 'cleaned_data'
表单显示正常，但是当我提交时出现错误： 'SearchForm' object has no attribute 'cleaned_data'
I'm not sure what's going on, can someone help me out? Thanks!
我不确定发生了什么，有人可以帮助我吗？谢谢！
采纳答案by Daniel Roseman
For some reason, you're re-instantiating the form after you check is_valid(). Forms only get a cleaned_dataattribute when is_valid()has been called, and you haven't called it on this new, second instance.
出于某种原因，您在检查后重新实例化表单is_valid()。表单只有cleaned_data在is_valid()被调用时才会获得一个属性，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.
只要摆脱第二个form = SearchForm(request.POST)，一切都会好起来的。
回答by hughdbrown
I would write the code like this:
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))
Pretty much like the documentation.
很像文档。
回答by subramanyam
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 功能中，我们不会有任何数据，尽管form.is_valid()会返回True。
