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)
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 have one model name is cityform
i want to get url parmeter in this CityFrom hwo can i do this?
here is my url
path('state/city/<int:id>/', City.as_view(), name="city")
http://localhost:8000/country/state/city/3/
here is my form
class
CityFrom(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(CityFrom,self).__init__(*args, **kwargs)
print(args)
print(kwargs)
self.fields['state'] = forms.ModelChoiceField(
empty_label = 'Select',
queryset = State.objects.all()
)
class Meta:
model = City
fields = ('state', 'name')
in this form i want to access id = 3
here is my view
from django.views import View
class City(View):
def get(self, request, *args, **kwargs):
Forms = CityFrom()
return render(request, 'albums/add.html', {'Forms': Forms})
Pass url parameter as keyword argument from views.py as following.
form = CityFrom(id=kwargs.get("id"))
To get the id in your forms.py, use following code in your form's __init__ method.
self.id = kwargs.get('id')
Your form should look like this.
CityFrom(forms.ModelForm):
def __init__(self, *args, **kwargs):
self.id = kwargs.get('id')
super(CityFrom,self).__init__(*args, **kwargs)
self.fields['state'] = forms.ModelChoiceField(
empty_label = 'Select',
queryset = State.objects.all()
)
class Meta:
model = City
fields = ('state', 'name')
* Call super after getting the id in your form as above. Here order of calling super is important.
Try
CityFrom(forms.ModelForm):
def __init__(self, *args, **kwargs):
self.id = kwargs.pop('id')
super(CityFrom,self).__init__(*args, **kwargs)
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)
Is there a way to modify the data obtained from the model before inserting it in the form?
Here's my model:
class SomeData(models.Model):
Some_No = models.ForeignKey('SomeDef', on_delete=models.PROTECT)
Some_Val = models.DecimalField(max_digits=10, decimal_places=3, verbose_name=_('Some_Val'))
And here's my form:
#autostrip
class SomeForm(forms.ModelForm):
class Meta:
model = models.SomeData
fields = ('Some_Val', 'Some_No')
def __init__(self, *args, **kwargs):
super(SomeForm, self).__init__(*args, **kwargs)
self.fields['Some_No'].label = _(' ')
def clean_some(self):
some = None
some_id = self.cleaned_data['some']
some = models.SomeDef.objects.get(Some_No=some_id)
return some
def save(self, something, *args, **kwargs):
orig_commit = kwargs.get('commit', True)
kwargs['commit'] = False
ri = super(SomeForm, self).save(*args, **kwargs)
ri.Some_No = something
if orig_commit:
try:
ri.save()
except ValidationError as e:
raise ValidationError
return ri
The data saved inside of the models is a bit different from what I want to show in the forms when these are populated with data. However, I cannot figure out how to do it in a smart way.
Using the pre_save signal. Signals
You can set the initial value in the __init__ method:
def __init__(self, *args, **kwargs):
super(SomeForm, self).__init__(*args, **kwargs)
self.fields['Some_No'].initial = f(self.instance)
You can pass an initial data dictionary argument to your form, when you instantiate it into your view.
So, I have the following form:
class DesignItemForm (forms.ModelForm):
def __init__(self, *args, **kwargs):
super(DesignItemForm, self).__init__(*args, **kwargs)
CHOICES=[(i,i) for i in range(MAX_DESIGN_ITEM_QUANTITY)]
self.fields['quantity'] = forms.ChoiceField(choices=CHOICES)
class Meta:
model = DesignItem
fields = ('quantity','trackable',)
My view:
d = Design.object.get(slug=fromInput)
....
DesignItemInlineFormSet = inlineformset_factory(Design, DesignItem, fk_name="design", form=DesignItemForm,)
if request.method == "POST":
formset = DesignItemInlineFormSet(request.POST, request.FILES, instance=d)
if formset.is_valid():
formset.save()
DesignItemInlineFormSet(instance=d)
As you can tell, in my form, I overwrote the quantity field to be a drop down instead of an integer field.
For some reason, when I submit the form, the data is not updated in the database. However, if I change the form to the following, it works (of course, it doesn't have the dropdowns I want, but it posts to the db). Why is this, and how do I fix it?
class DesignItemForm (forms.ModelForm):
def __init__(self, *args, **kwargs):
super(DesignItemForm, self).__init__(*args, **kwargs)
# CHOICES=[(i,i) for i in range(MAX_DESIGN_ITEM_QUANTITY)]
# self.fields['quantity'] = forms.ChoiceField(choices=CHOICES)
class Meta:
model = DesignItem
fields = ('quantity','trackable',)
EDIT: Here is the DesignItem model:
class DesignItem(models.Model):
"""Specifies how many of an item are in a design."""
design = models.ForeignKey(Design, related_name="items")
quantity = models.PositiveIntegerField(default=1)
trackable = models.ForeignKey(Trackable, related_name="used")
have you tried just overriding the widget instead of the whole field?
i guess you want a select widget
def __init__(self, *args, **kwargs):
super(DesignItemForm, self).__init__(*args, **kwargs)
CHOICES=[(i,i) for i in range(MAX_DESIGN_ITEM_QUANTITY)]
self.fields['quantity'].widget = forms.Select(choices=CHOICES)