- if ( (edgePayload.getId() == null) || (edgePayload.getType() == null) ) {
- throw new CrudException("id and type must be specified for patch request", Status.BAD_REQUEST);
+ if (edgePayload.getId() == null) {
+ throw new CrudException("id must be specified for patch request", Status.BAD_REQUEST);
+ }
+ Edge existingEdge = dao.getEdge(edgePayload.getId(), txId);
+
+ // If the type isn't set, resolve it based on on the sourece and target vertex types
+ if (edgePayload.getType() == null || edgePayload.getType().isEmpty()) {
+ edgePayload.setType(existingEdge.getType());