Django: passing min and max attributes to datepicker in ClassBased view - django-views

Question

I am creating an expense submission system, which is multi user. For the purpose of this question, there are two models: Claim and Journey. A user creates a claim and each claim can have multiple journeys.
In the Journey CreateView, the following code:
Autofills the claim dropdown for which a journey is being logged, based on the claim pk, passed in the URL.
Based on the logged in user, only shows claims for that user (in the dropdown)
Sets the HTML attribute's of the <input>; type=date renders the date selector, and min='2018-09-10' specifies a disallowed date range:
In the following view, I am calculating the min and max dates, which output correctly in the sanity check:
class JourneyCreateView(CreateView):
model = Journey
form_class = JourneyForm
def get_initial(self):
try:
# Calculate date limit for the date picker
min = Claim.objects.get(id=self.kwargs['claim']).week_commencing
max = min + timedelta(days=7)
# Obtain the claim ID from the URL
claim = self.kwargs['claim']
# Sanity check
print (claim, min, max)
return {'claim': claim, 'min':min, 'max':max}
except Exception as ex:
print (ex)
return {}
def get_form_kwargs(self, *args, **kwargs):
# Only show claims owned by the logged in user in the claim dropdown
kwargs = super().get_form_kwargs(*args, **kwargs)
kwargs['alloweduser'] = self.request.user.id
return kwargs
And the Form:
class JourneyForm(forms.ModelForm):
# set html attribs which will apply to the form.
date = forms.CharField(widget=forms.TextInput(attrs={'type':'date',
'min':'2018-09-10'
}))
class Meta:
model = Journey
fields = ['date', 'distance','claim']
def __init__(self,alloweduser,*args,**kwargs):
# Make sure only to display the user's own claims.
super (JourneyForm,self ).__init__(*args,**kwargs)
self.fields['claim'].queryset = Claim.objects.filter(tech_id=alloweduser)
In this code claim is also returned by get_initial() and correctly pre-populates the claim dropdown with the current claim:
return {'claim': claim, 'min':min, 'max':max}
However, where I am confused is how I access the min and max variables, returned by get_initial() in the third line of the form, to replace the manual test string.

Answer 1

I have solved this myself. My solution is:
In the CreateView, put the logic in get_from_kwargs instead of the get_initial overide :
d = Claim.objects.get(id=self.kwargs['claim']).week_commencing
kwargs['min'], kwargs['max'] = d, d+timedelta(days=7)
The min and max then become arguments when overiding __init__ in the ModelForm:
def __init__(self,alloweduser,min,max,*args,**kwargs):
# Make sure only to display the user's own claims.
super (JourneyForm,self ).__init__(*args,**kwargs)
self.fields['claim'].queryset = Claim.objects.filter(tech_id=alloweduser)
self.fields['date'] = forms.CharField(widget=forms.TextInput(attrs={'type':'date',
'min':min, 'max':max
}))