如何通过 ModelForm 使用 FileField 添加 Django 模型的新实例？
我是 Django 初学者。我认为我的问题很微不足道，但我无法解决。 我有一个名为 Document 的模型，带有一个 FileField：
class Document(models.Model):
file = models.FileField(upload_to="documents")
created = models.DateTimeField(auto_now_add=True)
modified = models.DateTimeField(auto_now=True)
category = models.ForeignKey(DocumentCategory)
title = models.CharField(max_length=255, unique=True)
description = models.TextField()
def __unicode__(self):
return self.title
我想通过此 ModelForm 向该类添加一个新实例：
class DocumentForm(ModelForm):
class Meta:
model = Document
在views.py 中，我有：
def add_document(request):
if request.method == 'POST':
form = DocumentForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return HttpResponseRedirect('/')
else:
return render_to_response('add_document.html', {'form':form}, context_instance=RequestContext(request))
else:
form = DocumentForm()
return render_to_response('add_document.html', {'form':form}, context_instance=RequestContext(request))
此模板（即 add_document.html）：
{% extends "base.html" %}
{{block content %}
<form enctype="multipart/form-data" method="post" action="">{% csrf_token %}
{{form}}
<input type="submit" value="Add document" />
</form>
{% endblock %}
在管理界面中向数据库工作正常，并且添加文件处于“upload_to”本地化状态。我的表格不起作用。当我尝试提交表单时，我收到 Filefield 错误：“此字段是必需的！” 如果模型中没有 FileField，则此操作之前可以正常工作。 我有 Django 1.2.5 我用它折磨了3天，毫无效果！我很绝望。对不起我的语言。请帮忙！
I'm a Django beginner. I think my problem is trivial but I can't solve it.
I have a model named Document with one FileField:
class Document(models.Model):
file = models.FileField(upload_to="documents")
created = models.DateTimeField(auto_now_add=True)
modified = models.DateTimeField(auto_now=True)
category = models.ForeignKey(DocumentCategory)
title = models.CharField(max_length=255, unique=True)
description = models.TextField()
def __unicode__(self):
return self.title
I want to add a new instance to this class by this ModelForm:
class DocumentForm(ModelForm):
class Meta:
model = Document
In views.py I have:
def add_document(request):
if request.method == 'POST':
form = DocumentForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return HttpResponseRedirect('/')
else:
return render_to_response('add_document.html', {'form':form}, context_instance=RequestContext(request))
else:
form = DocumentForm()
return render_to_response('add_document.html', {'form':form}, context_instance=RequestContext(request))
Template for this (i.e. add_document.html):
{% extends "base.html" %}
{{block content %}
<form enctype="multipart/form-data" method="post" action="">{% csrf_token %}
{{form}}
<input type="submit" value="Add document" />
</form>
{% endblock %}
In the Admin Interface adding a model to the database is working correctly and adding a file is in "upload_to" localization. My form does not work. When I try to submit a form I get Filefield error: "This field is required!" Without FileField in model this works before.
I have Django 1.2.5
I torture with it for 3 days and nothing! I'm desperate. Sorry for my language. Please help!
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评论（2）
就像现在一样，需要一个文件。您是否尝试在没有文件的情况下保存表单？
如果您想让该文件成为可选文件，则需要按以下方式定义它：
作为附加说明，表单中的操作参数可能不正确。
它应该是一个 URL；通常在 Django 中，您需要放置
"."，但不是完全空的字符串 ("")。也就是说，我不知道这是否是一个问题。As it is now, a file is required. Are you trying to save the form without a file?
If you want to make the file optional, you need to define it in this way:
As a an additional note, the action parameter you have in the form may be incorrect.
It should be an URL; usually in Django you would want to put
".", but not a completely empty string (""). That said, I do not know if this may be an issue or not.在文档模型中，您将文件设置为 upload_t0“文档”，但 upload_to 到底指向哪里。
可能会有帮助。
In you Document model, you have your file set to upload_t0 "documents", but where exactly is upload_to pointed to.
May be this will help.