def q_realization_add_relationship_value(request):
valid_request, msg = validate_request(request)
if not valid_request:
return HttpResponseForbidden(msg)
target_proxy_id = request.POST.get("target_proxy_id")
property_key = request.POST.get("key")
session_key = get_key_from_request(request)
cached_realizations_key = "{0}_realizations".format(session_key)
cached_realizations = get_cached_object(request.session, cached_realizations_key)
if not cached_realizations:
msg = "unable to locate cached_realizations"
raise QError(msg)
property = get_property_realization_by_fn(
lambda r: r.get_key() == property_key,
cached_realizations
)
if not property:
raise QError("unable to find property w/ key='{0}'".format(property_key))
target_proxy = QModelProxy.objects.get(id=target_proxy_id)
new_model_realization = get_new_realizations(
project=cached_realizations.project,
ontology=cached_realizations.ontology,
model_proxy=target_proxy,
key=target_proxy.name,
)
# double-check that adding this model to this property makes sense...
assert target_proxy in property.proxy.relationship_target_models.all()
assert property.get_cardinality_max() == '*' or property.relationship_values(manager="allow_unsaved_relationship_values_manager").count() < int(property.get_cardinality_max())
# add the model...
property.relationship_values(manager="allow_unsaved_relationship_values_manager").add_potentially_unsaved(new_model_realization)
with allow_unsaved_fk(QModel, ["relationship_property"]):
# in theory, Django doesn't store unsaved relationship
# the custom manager above gets around this for the m2m relationship (property to model) and it is what I ought to use
# however, in order to work my way up the realization hierarchy I need access to the reverse of that relationship
# which is a fk relationship; hence this extra bit of code (which only exists so that "model_realizations.py#QRealization.get_parent_model_realization" works)
new_model_realization.relationship_property = property
# re-cache the changed realizations...
request.session[cached_realizations_key] = cached_realizations
# and return a serialized version of that model...
new_model_realization_serialization = serialize_new_realizations(new_model_realization)
return JsonResponse(new_model_realization_serialization)
def q_realization_remove_relationship_value(request):
valid_request, msg = validate_request(request)
if not valid_request:
return HttpResponseForbidden(msg)
target_index = int(request.POST.get("target_index"))
property_key = request.POST.get("key")
session_key = get_key_from_request(request)
cached_realizations_key = "{0}_realizations".format(session_key)
cached_realizations = get_cached_object(request.session, cached_realizations_key)
if not cached_realizations:
msg = "unable to locate cached_realizations"
raise QError(msg)
property = get_property_realization_by_fn(
lambda r: r.get_key() == property_key,
cached_realizations
)
if not property:
raise QError("unable to find property w/ key='{0}'".format(property_key))
# remove the model...
try:
target_to_remove = property.relationship_values(manager="allow_unsaved_relationship_values_manager").all()[target_index]
property.relationship_values(manager="allow_unsaved_relationship_values_manager").remove_potentially_unsaved(target_to_remove)
if target_to_remove.is_existing():
target_to_remove.delete()
except IndexError:
raise QError("unable to find target of {0} at index {1}".format(property, target_index))
# re-cache the changed realizations...
request.session[cached_realizations_key] = cached_realizations
# and return a success msg...
msg = "Successfully removed object"
# (don't need to explicitly render this msg using Django messaging framework)
# (b/c it will be obvious to the user that a model was removed since a subform will dissappear)
# (and, anyway, there is no corresponding msg that is used when a model is added to a property)
# messages.add_message(request, messages.SUCCESS, msg)
return JsonResponse({"msg": msg})
