def create_operation(operation_key, handler_classes, resource_oql, modifier_id):
if type(handler_classes) == str:
handler_classes = [handler_classes]
query = Operation.all()
for handler_class in handler_classes:
query.filter("handler_classes like ", "%%%s%%" % handler_class)
if query.count() > 0:
raise CoreError("One handler only can have one corresponding operation. The handler %s is corresponding to multiple operations." % handler_class)
query = Operation.all()
query.filter("operation_key =", operation_key)
operation = Operation(operation_key=operation_key)
operation.handler_classes = ",".join(handler_classes)
operation.resource_oql = resource_oql
operation.create(modifier_id)
return operation
