I need a view to edit Enrollment objects for a particular Offering.
An Offering has a foreign key to a Room and a Course. All three of
these (Offering, Room, and Course) have a maximum capacity field which
can be null (for unlimited). Offering has a method called
get_max_capacity() which returns the minimum of all 3 maximums or None
if none have them defined.
An Enrollment has a foreign key to User and Offering.
I need a per-offering view of enrollments. Where the number of forms
is the maximum capacity of the Offering or 3 extra if not defined. I
would like to edit all fields (except for the foreign key to Offering
since this view is offering specific).
I am having the following problems trying to make the view Offering
specific.
1) Trying to use exclude=('offering',) since all Enrollments in this
view should be for the given offering.
2) Trying to make the view offering specific by using
queryset=offering.enrollment_set.all().
Without 1) or 2) I am able to edit existing Enrollments. I am able to
create new Enrollments using the empty forms.
When I have exclude=('offering',) I cannot make use of the extra forms
because it will complain about no offering_id being set.
When I use queryset=offering.enrollment_set.all() and I submit, it
complains about all the empty forms not having information in them.
What am I doing wrong?
Here is my template and view code....
{% extends "train/base_admin.html" %}
{% block content %}
<h1>Enrollments for {{ offering }}</h1>
<form method="POST" action="">
{{ formset.management_form }}
{% for form in formset.forms %}
<table>
{{ form }}
</table>
<hr/>
{% endfor %}
<input type="submit" value="Submit" />
</form>
{% endblock %}
@login_required
def offering_admin(request, location_slug, offering_id):
offering = get_object_or_404(Offering, id=offering_id)
location = get_object_or_404(Location, slug=location_slug)
# We use location in this view just so that urls look similar
# we could get location from offering's room. Still... make sure
# the url is okay.
if offering.room.location != location:
return showmessage(request, 'Bad url. Offering / Location
missmatch')
if not request.user.profile.gid in settings.TRAIN_ADMINS
[location.name]:
return showmessage(request, 'You are not an admin for location
%s' % location.long_name)
try:
extra = int(request.REQUEST.get('extra'))
except:
if offering.get_max_capacity():
extra = offering.get_max_capacity() -
offering.enrollment_set.count()
else:
extra = 3
EnrollmentFormSet = modelformset_factory(Enrollment, extra=extra,
exclude=('offering',))
if request.method == 'POST':
formset = EnrollmentFormSet(request.POST, request.FILES)
if formset.is_valid():
print 'VALID!!!'
# do something with the formset.cleaned_data
formset.save()
# calling save may have populated variables (like cost
center when left blank)
# so get it again from the database rather than the
request
#formset = EnrollmentFormSet
(queryset=offering.enrollment_set.all())
else:
#formset = EnrollmentFormSet
(queryset=offering.enrollment_set.all())
formset = EnrollmentFormSet()
return render_to_response(
'train/offering_admin_form.html',
{'offering': offering,
'formset' : formset,},
context_instance=RequestContext(request)
)
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