def get_merge(request, node_id, merge_type=None):
"""
This function handles a submitted form containing information
about merging concepts.
"""
auth = ContributorProfile.auth_status(request.user)
if auth != 'staff':
raise PermissionDenied
if request.method == 'POST':
node = get_object_or_404(ConceptNode,pk=node_id)
#differentiate between different forms
if merge_type == 'add merge':
form = CreateMergeForm(request.POST, node=node)
elif merge_type == 'subtract merge':
form = UpdateMergeFormSet(request.POST)
else:
#should never get here
print "ERROR No Merge type was called"
# note that "form" could be either a single form or a formset
# depending on whether the user did a 'add merge' or an
# 'update merge'. For this reason, we have to do an additional
# attribute check
if form.is_valid(): #could be a form or a formset depending on request
# user merged under a new concept atom
if hasattr(form,'add_merge_id') and form.add_merge_id in request.POST:
new_atom = ConceptAtom(concept_node=node,
user=request.user,
text=form.cleaned_data.get('new_atom_name'),
final_choice=True,)
new_atom.save()
new_atom.add_merge_atoms(form.cleaned_data.get('free_atoms'))
#user merged atoms to an existing concept atom
elif hasattr(form,'subtract_merge_id') and form.subtract_merge_id in request.POST:
curr_atom = form.cleaned_data.get('merged_atoms')
curr_atom.add_merge_atoms(form.cleaned_data.get('free_atoms'))
#user has edited an existing concept atom
else:
formset = form #small name-change to enhance clarity
for form in formset:
if form.cleaned_data.get('delete'):
atom = ConceptAtom.objects.filter(pk=form.cleaned_data.get('pk')).get()
atom.delete()
else:
for atom in form.cleaned_data.get('choices'):
atom.merged_atoms = None
atom.save()
return redirect('merge', node_id=node.id)
#the form is invalid, and we redirect the errors to the user
else:
render_args = {'node': node,
'user': request.user}
#need to set arguments differently based on whether it was
#an add merge or subtract merge, since this chooses
#between a form or formset
if merge_type == 'add merge':
render_args['create_form'] = form
render_args['edit_formset'] = UpdateMergeFormSet(initial=[{'pk': atom.pk} for atom in ConceptAtom.get_final_atoms(node)])
elif merge_type == 'subtract merge':
render_args['create_form'] = CreateMergeForm(node)
render_args['edit_formset'] = form
else:
#again, should never be here
print "ERROR unknown merge type"
return render(request, 'nodemanager/merge.html', context)
else:
return redirect('stage1 dispatch')
