def process_modelformset(request, model_class, queryset, **kwargs):
"""With the Django model class `model_class` and the given `queryset`,
construct a formset process its submission.
"""
# Create a formset class for the model `model_class` (i.e. it will contain
# forms whose contents are based on the fields of `model_class`);
# parameters for the construction of the forms used in the formset should
# be in kwargs.
formset_class = modelformset_factory(model_class, **kwargs)
if queryset is None:
queryset = model_class.objects.all()
# If the request is a POST, we want to possibly update our data
if request.method == 'POST' and request.POST:
# Create a formset from all the 'model_class' instances whose values
# will be updated using the contents of request.POST
objects = paginate(request, queryset)
formset = formset_class(request.POST, queryset=objects.object_list)
# Validate all the forms in the formset
if formset.is_valid():
# If all is well, Django can save all our data for us
formset.save()
else:
# Otherwise, complain to the user that something went wrong
return formset, _("There are errors in the form. Please review "
"the problems below."), objects
# Hack to force reevaluation of same query
queryset = queryset.filter()
objects = paginate(request, queryset)
return formset_class(queryset=objects.object_list), None, objects
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