I'm building a library system and have models Member, Loan and
LoanItem (relationships as you'd expect), and an inline formset to
enter a new loan (Loan and LoanItems).
A member can borrow up to 6 books at a time, so my form contains 7
individual forms (1 loan and 6 loan items), I need to get the member
from the loan and the number of loan items from the loan items forms
then raise an error if the items already loaned + the number of new
loan items entered is greater than 6.
I can raise errors based on the form or the formset but not both
together, is this possible? What do I subclass to add the custom clean
method?
Here's my unfinished view
def loan_add_form(request,template_name='resources/
loan_add_form.html'):
loan = Loan()
LoanItemFormset = inlineformset_factory
(Loan,LoanItem,formset=LoanItemBaseModelFormSet,can_delete=False,extra=6,exclude='date_returned')
if request.method == 'POST':
loan_form = forms.LoanForm(request.POST,instance=loan)
loan_item_formset = LoanItemFormset
(request.POST,request.FILES,instance=loan)
if loan_form.is_valid() and loan_item_formset.is_valid():
loan_form.save()
loan_item_formset.save()
# request.user.message_set.create(message="Confirmation
message.")
# return HttpResponseRedirect('/somepath')
else:
loan_form = forms.LoanForm(instance=loan)
loan_item_formset = LoanItemFormset(instance=loan)
context = {
'loan_form': loan_form,
'loan_item_formset': loan_item_formset,
}
return render_to_response(template_name, context,
context_instance=RequestContext(request))
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