在is_valid()之前设置表单域值 [英] Set form field value before is_valid()
问题描述
我将从一些代码开始,并解释我正在努力做什么:
models.py
class Action(models.Model) :
title = models.CharField(max_length = 200)
owner = models.ForeignKey(User,related_name ='actions')
created_by = models.ForeignKey(User,related_name ='+' ,editable = False)
modified_by = models.ForeignKey(User,related_name ='+',editable = False)
class ActionForm(ModelForm):
class Meta:
model = Action
views.py
默认情况下,所有者有一个下拉字段。我有一个图标,允许用户在文本字段中输入新的用户名,而不是为所有者输入。我查看是否提交了 owner_new
,如果是,请创建该用户。然后,我需要将所有者
字段设置为该值,以便 form.is_valid()
将成为true。 p>
def action_create(request):
如果request.method =='POST':
form = ActionForm request.POST)
#检查是否应该创建新用户
如果请求中的owner_new.POST:
#检查用户是否已经存在
user = User.objects.get (username = request.POST.get('owner_new'))
如果不是用户:
user = User.objects.create_user(request.POST.get('owner_new'))
#这里是我在哪里学习
form.owner = user.id
如果form.is_valid():#这个失败BECAUSE form.owner不设置
action = form.save( commit = False)
action.created_by = request.user
action.modified_by = request.user
action.save()
返回重定向('action_registe r:index')
else:
form = ActionForm()
return render(request,'actions / create.html',{'form':form})
你可以试试这个:
$ b $
$ b如果request.method =='POST':
form = ActionForm(request.POST)
#检查是否应该创建新用户
如果request中有owner_new.POST:
#检查用户是否已经存在
user,_ = User.objects.get_or_create(username = request.POST。 get('owner_new')
updated_data = request.POST.copy()
updated_data.update({'owner':user})
form = MyForm(data = updated_data)
如果form.is_valid():#这个失败BECAUSE form.owner不设置
action = form.save(commit = False)
action.created_by = request.user
行为ion.modified_by = request.user
action.save()
返回重定向('action_register:index')
else:
form = ActionForm()
返回渲染(请求'action / create.html',{'form':form})
这样做的方式是:
添加 required = False
到所有者
字段。
现在,
if form.is_valid():#这个失败因为form.owner没有设置
action = form.save(commit = False)
如果request中有owner_new.POST:
user,_ = User.objects.get_or_create(username = request.POST.get('owner_new' ))
action.owner = user
action.created_by = request.user
action.modified_by = request.user
action.save()
return redirect(' Action_register:index')
I'm having a bit of trouble grasping how to do this. I've put my best effort into searching Google without any luck.
I'll start with a bit of code and explain what I'm trying to do as I go:
models.py
class Action(models.Model):
title = models.CharField(max_length=200)
owner = models.ForeignKey(User, related_name='actions')
created_by = models.ForeignKey(User, related_name='+', editable=False)
modified_by = models.ForeignKey(User, related_name='+', editable=False)
class ActionForm(ModelForm):
class Meta:
model = Action
views.py
By default, there is a dropdown field for owner. I have an icon that allows the user to enter a new username in a text field instead for owner. I check to see if owner_new
was submitted and if so, create that user. I then need to set the owner
field to that value so that form.is_valid()
will be true.
def action_create(request):
if request.method == 'POST':
form = ActionForm(request.POST)
# check if new user should be created
if 'owner_new' in request.POST:
# check if user already exists
user = User.objects.get(username=request.POST.get('owner_new'))
if not user:
user = User.objects.create_user(request.POST.get('owner_new'))
# HERE IS WHERE I'M STUMPED
form.owner = user.id
if form.is_valid(): # THIS FAILS BECAUSE form.owner ISN'T SET
action = form.save(commit=False)
action.created_by = request.user
action.modified_by = request.user
action.save()
return redirect('action_register:index')
else:
form = ActionForm()
return render(request, 'actions/create.html', {'form': form})
You can try this:
def action_create(request):
if request.method == 'POST':
form = ActionForm(request.POST)
# check if new user should be created
if 'owner_new' in request.POST:
# check if user already exists
user, _ = User.objects.get_or_create(username=request.POST.get('owner_new'))
updated_data = request.POST.copy()
updated_data.update({'owner': user})
form = MyForm(data=updated_data)
if form.is_valid(): # THIS FAILS BECAUSE form.owner ISN'T SET
action = form.save(commit=False)
action.created_by = request.user
action.modified_by = request.user
action.save()
return redirect('action_register:index')
else:
form = ActionForm()
return render(request, 'actions/create.html', {'form': form})
A cleaner way of doing this is:
add required=False
to the owner
field.
Now,
if form.is_valid(): # THIS FAILS BECAUSE form.owner ISN'T SET
action = form.save(commit=False)
if 'owner_new' in request.POST:
user, _ = User.objects.get_or_create(username=request.POST.get('owner_new'))
action.owner = user
action.created_by = request.user
action.modified_by = request.user
action.save()
return redirect('action_register:index')
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