Django - ModelForm创建或更新? [英] Django - ModelForm Create or Update?
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问题描述
我需要一个表单,允许在计划中创建或添加会话
模型
class Session(models.Model):
tutor = models.ForeignKey(User)
start_time = models.DateTimeField()
end_time = models.DateTimeField ()
表单
class SessionForm(forms.ModelForm):
class Meta:
model = Session
exclude = ['tutor']
查看以呈现表单
def editor(请求):
如果request.method =='GET':
如果request.GET ['id']!='0':
#用户选择了一个会话
session = Session.objects.get(id = request.GET ['id'])
form = SessionForm(instance = session)
else:
#用户想添加一个新的session
form = SessionForm()
return r ender_to_response('planner / editor.html',
{'form':form,},context_instance = RequestContext(request),)
Template editor.html
< form action = / planner / postmethod =post> {%csrf_token%}
{{form.as_p}}
< / form>
查看以发布价值
def post(request):
如果request.method =='POST':
form = SessionForm(request.POST)
如果form.is_valid() :
form.instance.tutor = request.user
form.save()
obj = {'posted':True}
return HttpResponse(json.dumps(obj) mimetype ='application / json')
else:
return render_to_response('planner / editor.html',
form,context_instance = RequestContext(request),)
问题
会话始终创建(永不更新)
问题
- 在我看来
post
我如何知道会话必须更新而不是创建? - 有没有办法简化这段代码?
解决方案
如果要更新se您需要在绑定窗体时提供实例。
如果表单有效,则可以保存与 commit = False
更新导师。
form = SessionForm(instance = instance,data = request.POST)
pre>
如果form.is_valid ():
instance = form.save(commit = False)
instance.tutor = request.user
instance.save()
I need to have a form that allows the creation or addition of sessions on a planning
Model
class Session(models.Model): tutor = models.ForeignKey(User) start_time = models.DateTimeField() end_time = models.DateTimeField()
Form
class SessionForm(forms.ModelForm): class Meta: model = Session exclude = ['tutor']
View to render the form
def editor(request): if request.method == 'GET': if request.GET['id'] != '0': # The user has selected a session session = Session.objects.get(id=request.GET['id']) form = SessionForm(instance=session) else: # The user wants to add a new session form = SessionForm() return render_to_response('planner/editor.html', {'form': form,}, context_instance=RequestContext(request),)
Template editor.html
<form action="/planner/post" method="post">{% csrf_token %} {{ form.as_p }} </form>
View to post the values
def post(request): if request.method == 'POST': form = SessionForm(request.POST) if form.is_valid(): form.instance.tutor = request.user form.save() obj = {'posted': True} return HttpResponse(json.dumps(obj), mimetype='application/json') else: return render_to_response('planner/editor.html', form, context_instance=RequestContext(request),)
Problem
Sessions are always created (never updated)
Questions
- In my view
post
how do I know that the session must be updated and not created ? - Is there a way to simplify this code ?
解决方案
If you want to update a session, you need to provide the instance when you bind the form.
If the form is valid, you can then save with commit=False
, and update the tutor.
form = SessionForm(instance=instance, data=request.POST)
if form.is_valid():
instance = form.save(commit=False)
instance.tutor = request.user
instance.save()
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