I am new to django (until now, I used the symfony PHP Framework). My problem is this: I have a model Event and model Date. The Date has a foreign key to Event, so that an Event may (or should) have one or more Dates.
Now I want to have a form to create Events and this form should include a subform for adding one corresponding Date (more dates should be added later, if the Event has more than one date).
I used the inlineformset to realize the Date subform, but if no Date is being entered, no error occurs and the Event is being saved without a Date. All I want is to make this inlineformset required or to say, that there has to be at lease (and only) one inlineformset.
I found these questions, but none of the answers helped me:
Any hints for me?
EDIT: I need this for the frontend, not for the backend. The first link covers it for the admin backend.
EDIT2: Some sourcecode added
MandatoryInlineFormSet.py:
from django.forms.models import BaseInlineFormSet
from django import forms
class MandatoryInlineFormSet(BaseInlineFormSet):
def clean(self):
# get forms that actually have valid data
count = 0
for form in self.forms:
try:
if form.cleaned_data:
count += 1
except AttributeError:
# annoyingly, if a subform is invalid Django explicity raises
# an AttributeError for cleaned_data
pass
if count < 1:
raise forms.ValidationError('You must have at least one order')
event.py:
from [...]
def new(request):
DateFormset = inlineformset_factory(
Event,
Date,
can_delete=False,
extra=1,
max_num=1,
formset=MandatoryInlineFormSet,
)
if request.POST:
form = EventForm(request.POST)
date_formset = DateFormset(request.POST)
if form.is_valid():
event = form.save(commit=False)
date_formset = DateFormset(request.POST, instance=event)
if date_formset.is_valid():
event.save()
date_formset.save()
return HttpResponseRedirect(reverse('frontpage'))
else:
form = EventForm()
date_formset = DateFormset()
return render_to_response('event/new.html', {
'form': form,
'date_formset': date_formset,
}, context_instance=RequestContext(request))
event/new.html:
[...]
<form action="{% url new-event %}" method="post">
{% csrf_token %}
{{ form.as_p }}
{{ date_formset.management_form }}
{% for date_form in date_formset.forms %}
{{ date_form.as_p }}
{% endfor %}
<input type="submit" value="{% trans "Create event" %}"/>
</form>
[...]
Best regards, sewid
