diff --git a/api/v1/controllers/index.js b/api/v1/controllers/index.js
index b1759de..91b1574 100644
--- a/api/v1/controllers/index.js
+++ b/api/v1/controllers/index.js
@@ -7,6 +7,6 @@ module.exports = {
 	PermissionController: require('./PermissionController.js'),
 	ProjectController: require('./ProjectController.js'),
 	HealthController: require('./HealthController.js'),
-	RSVPController: require('./RSVPController.js')
+	RSVPController: require('./RSVPController.js'),
 	StatsController: require('./StatsController.js')
-};
\ No newline at end of file
+};
diff --git a/api/v1/services/RegistrationService.js b/api/v1/services/RegistrationService.js
index 3681ea3..5150a98 100644
--- a/api/v1/services/RegistrationService.js
+++ b/api/v1/services/RegistrationService.js
@@ -84,17 +84,19 @@ function _extractRelatedObjects(model, fkName, related) {
 /**
  * Removes unwanted objects and updates desired objects
  * @param  {Model} model			the model with which the ideas are associated
+ * @param  {String} parentKey		the foreign key name for the associated model
  * @param  {Object} adjustments		the resolved result of #_extractRelatedObjects
  * @param  {Transaction} t			a pending transaction
  * @return {Promise<>}				a promise indicating all changes have been added to the transaction
  */
-function _adjustRelatedObjects(model, adjustments, t) {
+function _adjustRelatedObjects(model, parentKey, adjustments, t) {
 	var relatedPromises = [];
 
 	_.forIn(adjustments, function (adjustment, relatedName) {
 		var promise = model.related(relatedName)
 			.query().transacting(t)
 			.whereNotIn('id', adjustment.updatedIds)
+			.where(parentKey, model.get('id'))
 			.delete()
 			.catch(Model.NoRowsDeletedError, function () { return null; })
 			.then(function () {
@@ -290,7 +292,7 @@ module.exports.updateMentor = function (mentor, attributes) {
 		})
 		.then(function (adjustments){
 			return Mentor.transaction(function (t) {
-				return _adjustMentorIdeas(mentor, adjustments, t).then(function () {
+				return _adjustMentorIdeas(mentor, "mentor_id", adjustments, t).then(function () {
 					return _saveWithRelated(mentor, { 'ideas': adjustments.ideas.new }, t);
 				});
 			});
@@ -426,7 +428,7 @@ module.exports.updateAttendee = function (attendee, attributes) {
 		})
 		.then(function (adjustments) {
 			return Attendee.transaction(function (t) {
-				return _adjustRelatedObjects(attendee, adjustments, t)
+				return _adjustRelatedObjects(attendee, "attendee_id", adjustments, t)
 					.then(function () {
 						var newRelated = _.mapValues(adjustments, function (adjustment, adjustments) {
 							return adjustment.new;