我是 django 初学者(django 1.2.5)我有那个模型:
class Document(models.Model):
file = models.FileField(upload_to='documents/%Y/%m/%d', null=True, blank=True)
title = models.CharField(max_length=30)
created = models.DateTimeField(auto_now_add=True)
modified = models.DateTimeField(auto_now=True)
author = models.ForeignKey(User)
#other fields
#other fields
和模型形式:
class DocumentForm(ModelForm):
file = forms.FileField(required=True, error_messages={'required' : 'required!','empty': "empty!"})
title = forms.CharField(widget = forms.TextInput(attrs={'size': 93,}), error_messages={'required': 'required!'})
#other fields
#other fields
class Meta:
model = Document
exclude = ('author',)
def save(self, author, commit=True):
document=ModelForm.save(self,commit=False)
document.author = author
if commit:
document.save()
return document
我使用上面的 DocumentForm 上传新文档,它工作得很好,但是当我尝试编辑一些文档时,我无法将新文件放在以前的位置。我可以更改除 FileField 之外的每个字段。
def document_edit(request, document_id):
doc = get_object_or_404(Document, id=document_id)
form = DocumentForm(instance=doc)
if doc.author == request.user:
if request.method == "POST":
form = DocumentForm(request.POST, request.FILES, instance=doc)
if form.is_valid():
if request.POST.get('cancel'):
return HttpResponseRedirect('/')
elif request.POST.get('delete'):
document = Document.objects.get(id=document_id)
document.file.delete()
document.delete()
return HttpResponseRedirect('/')
else:
form.save(author=request.user)
return HttpResponseRedirect('/')
else:
# return again form with errors
else:
# return form with doc instance
else:
# return "you can't edit this doc!"
我研究了 django 文档,我只知道我应该在某个类中编写一些自定义保存方法,但我完全不知道我该怎么做。应该是 Document() 还是 DocumentForm() 中的 save() 方法?通常我想要这个:当我在表单中输入新文件的路径时,我想在他的位置覆盖这个新文件并自动删除以前的文件。
你能帮助我吗?提前致谢!