I tried this approached to allow project_id to be dynamic, but i get an error:"init() missing 1 required positional argument: 'project_id'".
forms.py
class CreateCostForm(forms.ModelForm):
def __init__(self,project_id,*args, **kwargs):
super(CreateCostForm, self).__init__(*args, **kwargs)
self.fields['cost_name'].queryset = ProjectCost.objects.filter(project_name_id=project_id)
class meta:
model = ProjectCost
When i hard-code the value of project_id like:
self.fields['project_name'].queryset = ProjectCost.objects.filter(project_name_id=4) or
ProjectCost.objects.filter(project_name_id= 8),
i get the correct filtered options on the form.So how can i make project_id dynamic?
Thanks.
try getting the project_id from the kwargs, something like:
def __init__(self, *args, **kwargs):
project_id = kwargs.pop('project_id', None)
super(CreateCostForm, self).__init__(*args, **kwargs)
self.fields['cost_name'].queryset = ProjectCost.objects.filter(project_name_id=project_id)
Related
I have a cbv create view that displays a modelform.
I want to preselect a foreignkey field which is displayed as select choice field.
My problem is that kwargs.get('building_id') in modelform returns None
class VlanCreateForm(ModelForm):
class Meta:
model = Vlan
fields = ['number','description','network','building']
def __init__(self, *args, **kwargs):
building_id = kwargs.get('building_id')
super().__init__(*args, **kwargs)
self.fields['building'].initial = building_id
building is a foreign key to buildings. If I put a constant like self.fields['building'].initial = 1 it is working
class VlanCreateView(CreateView):
model = Vlan
form_class = VlanCreateForm
and the url is
vlan/building/<int:building_id>/create
so I call it like
vlan/building/1/create
You'll need to define the building id in get_form_kwargs
class VlanCreateView(CreateView):
...
building_id=None
def dispatch(self, request, *args, **kwargs):
# Retrieves the building id from url
self.building_id=kwargs.get("building_id")
return super().dispatch(request, *args, **kwargs)
def get_form_kwargs(self, *args, **kwargs):
kwargs=super().get_form_kwargs(*args, **kwargs)
## Sends building id to the form
kwargs["building_id"]=self.building_id
return kwargs
class VlanCreateForm(ModelForm):
class Meta:
model = Vlan
fields = ['number','description','network','building']
def __init__(self, *args, **kwargs):
self.building_id = kwargs.get('building_id')
super().__init__(*args, **kwargs)
self.fields['building'].initial = self.building_id
def post_url(self):
return reverse('app_name:url_name',kwargs={'cg_id':self.building_id} )
In form post action use this post_url for submit form.
then you got the building_id in your view kwargs
I would like to get the current logged in user id in my forms.py. I want to get the id of logged in user.
I am trying to query like this :
class ProcessForm(forms.ModelForm):
company_objective = CompanyObjectives.objects.get(user_rel_objectives=request.user.id)
I get an error NameError: name 'request' is not defined. This makes sense but I have no idea how to get the id here. Plz, advise.
I did this :
in the view i have this:
user = request.user.id form = ProcessForm(user=request.user)
and in the form i have this :
> def __init__(self, *args, **kwargs):
> user = kwargs.pop('user', None)
> super(ProcessForm, self).__init__(*args, **kwargs)
> company_objective = CompanyObjectives.objects.get(user_rel_objectives=user.id)
> print (company_objective.cost_reduction)
I did it like this...
views.py
context['form'] = ProcessForm(user=request.user.id)
forms.py
class ProcessForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
user = kwargs.pop('user', None)
super(ProcessForm, self).__init__(*args, **kwargs)
self.fields['company_objective'] = CompanyObjectives.objects.get(user_rel_objectives=user)
I am trying to make the 'cost_name' field choices to be filtered based on the dynamic project_id.
models.py
class ProjectCost(models.Model):
project_name = models.ForeignKey(ProjectName, on_delete=models.CASCADE,null=True)
cost_name = models.CharField('Cost Name', max_length=50)
total_budget = models.DecimalField('Total Budget', max_digits=9,decimal_places=2)
forms.py
class CreateCostForm(forms.ModelForm):
def __init__(self,project_id,*args, **kwargs):
super(CreateCostForm, self).__init__(*args, **kwargs)
self.fields['cost_name'].queryset = ProjectCost.objects.filter(project_name_id=project_id)
class meta:
model = ProjectCost
When i hard-code the value of project_id like:
self.fields['project_name'].queryset = ProjectCost.objects.filter(project_name_id=4) or
ProjectCost.objects.filter(project_name_id= 8),
i get the correct filtered options on the form.So how can i make project_id dynamic?
i tried:
def __init__(self, *args, **kwargs):
project_id = kwargs.pop('project_id', None)
super(CreateCostForm, self).__init__(*args, **kwargs)
self.fields['cost_name'].queryset = ProjectCost.objects.filter(project_name_id=project_id)
But this returns 'None' for the value of 'project_id'. Any idea on how to fix this?
Thanks.
As you are sub-classing from CreateView, then there is a method call get_form_kwargs() to send data from View to Form. Just override it like this:
class YourView(CreateView):
...
def get_form_kwargs(self, *args, **kwargs):
form_kwargs = super(YourView, self).get_form_kwargs(*args, **kwargs)
form_kwargs['project_id'] = self.kwargs.get('project_id') # assuming you send the project_id through url ie path('project/<int:project_id>/create/', YourView.as_view())
return form_kwargs
In that way you will be get data in project_id in Form:
Class CreateCostForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
project_id = kwargs.pop('project_id', None)
I am trying to load a form with user payment options, so this is needing a query set from the users profile.
I have tried initializing the form (below code) with user being required. The issue is if I make self.options when I am initializing. I have also tried creating the choice_field
class ListPaymentOptionsForm(forms.Form):
choice_field = forms.ChoiceField(widget=forms.RadioSelect, choices=options)
def __init__(self, user, *args, **kwargs):
self.options = list(UserPaymentOption.objects
.values_list('last_four', 'last_four')
.filter(user=user, active=True))
super(ListPaymentOptionsForm, self).__init__(self, *args, **kwargs)
The above code gives this error:
choice_field = forms.ChoiceField(widget=forms.RadioSelect, choices=options)
NameError: name 'options' is not defined
Then I have tried adding the options on the view instead like this
form = ListPaymentOptionsForm(user=request.user)
form.fields['choice_field'].choices = list(UserPaymentOption.objects
.values_list('id', 'last_four')
.filter(user=request.user, active=True))
This causes an error with the form being used on post, it seems like because it is trying to validate the value provided is a choice but in the actual form the choice is not set. The reason I believe this is the problem is this is what the form returns as
form=ListPaymentOptionsForm(request.POST)
print(form)
This returns: Choice field:Select a valid choice. 54 is not one of the available choices.
Any input on this would be very appreciated. Thanks.
Nearly there!
Try doing the fields['choice_field'].choices in the constructor.
class ListPaymentOptionsForm(forms.Form):
def __init__(self, user, *args, **kwargs):
super().__init__(*args, **kwargs) # assuming python 3 constructor
self.options = list(UserPaymentOption.objects.values_list('last_four', 'last_four').filter(user=user, active=True))
self.fields['choice_field'] = forms.ChoiceField(widget=forms.RadioSelect, choices=self.options)
Maybe consider having a look at ModelChoiceField instead however, that way you can specify a queryset instead of having to worry about creating a list:
class ListPaymentOptionsForm(forms.Form):
choice_field = forms.ModelChoiceField(widget=forms.RadioSelect, queryset=UserPaymentOption.objects.none())
def __init__(self, user, *args, **kwargs):
super().__init__(*args, **kwargs)
self.fields['choice_field'].queryset = UserPaymentOption.objects.filter(user=user, active=True)
EDIT based on comments we can use the kwargs to pass the user which may be better:
class ListPaymentOptionsForm(forms.Form):
choice_field = forms.ModelChoiceField(widget=forms.RadioSelect, queryset=UserPaymentOption.objects.none())
def __init__(self, *args, **kwargs):
user = kwargs.pop('user') # this must be done before super()
super().__init__(*args, **kwargs)
self.fields['choice_field'].queryset = UserPaymentOption.objects.filter(user=user, active=True)
Then instantiate the form to handle POST data:
form = ListPaymentOptionsForm(request.POST, user=user)
I have a custom form to which I would like to pass a parameter.
Following this example I came up with the following code :
class EpisodeCreateForm(forms.Form):
def __init__(self, *args, **kwargs):
my_arg = kwargs.pop('my_arg')
super(EpisodeCreateForm, self).__init__(*args, **kwargs)
my_field = forms.CharField(initial=my_arg)
But I get the following error:
Exception Value: name 'my_arg' is not defined
How can I get it to recognize the argument in the code of the form ?
You need to set the initial value by referring to the form field instance in __init__. To get access to the form field instance in __init__, put this before the call to super:
self.fields['my_field'].initial=my_arg
And remove initial=my_arg from where you declare my_field because at that point (when class is declared) my_arg is not in scope.
The thing is that my_field is initialized when the class is created, but my_arg is initialized when a new instance is created, far too late for my_field to know its value. What you can do is initialize my_field in __init__ too:
def __init__(self, *args, **kwargs):
my_arg = kwargs.pop('my_arg')
super(EpisodeCreateForm, self).__init__(*args, **kwargs)
if not self.my_field:
self.my_field = my_arg
This code is executed once at import time:
my_field = forms.CharField(initial=my_arg)
and this code is executed on form instance creation:
my_arg = kwargs.pop('my_arg')
super(EpisodeCreateForm, self).__init__(*args, **kwargs)
So this won't work this way. You should set initial value for the field in your __init__ method.
By the way, all this seems unnecessary, why don't use 'initial' keyword in a view?
Considering your comment, I would do this:
class EpisodeCreateForm(forms.Form):
def __init__(self, *args, **kwargs):
self.my_arg = kwargs.pop('my_arg')
kwargs.setdefault('initial', {})['my_field'] = self.my_arg
super(EpisodeCreateForm, self).__init__(*args, **kwargs)
def save(self):
do_something(self.my_arg)
...
super(EpisodeCreateForm, self).save()
my_field = forms.CharField()
Passing initial to the superclass and letting it do the work seems cleaner to me than directly setting it on the field instance.
You simply need to pop your arg before super() and put it in the fields dictionnary after super() :
class EpisodeCreateForm(forms.Form):
my_field = forms.CharField(label='My field:')
def __init__(self, *args, **kwargs):
my_arg = kwargs.pop('my_arg')
super(EpisodeCreateForm, self).__init__(*args, **kwargs)
self.fields['my_arg'].initial = my_arg
Then, simply call
form = EpisodeCreateForm (my_arg=foo)
As an example, say you have a table of Episodes, and you want to show the availables ones in a choices menu, and select the current episode. For that, use a ModelChoiceField:
class EpisodeCreateForm(forms.Form):
available_episode_list = Episode.objects.filter(available=True)
my_field = forms.ModelChoiceField(label='My field:',
queryset=available_episode_list)
def __init__(self, *args, **kwargs):
cur_ep = kwargs.pop('current_episode')
super(EpisodeCreateForm, self).__init__(*args, **kwargs)
self.fields['current_episode'].initial = cur_ep