diff --git a/app/controllers/collections/create.js b/app/controllers/collections/create.js
index 37192de..8b27025 100644
--- a/app/controllers/collections/create.js
+++ b/app/controllers/collections/create.js
@@ -11,6 +11,8 @@ export default Controller.extend(ValidationMixin, {
   CollectionSpeciesValidations,
   DatasheetValidations,
 
+  hasMany: ['collectionSpecies', 'datasheets'],
+
   options: computed('projectOptions', 'studyLocationOptions',
                     'collectionTypeOptions', 'collectionMethodOptions',
                     'speciesOptions', 'adfgPermitOptions', function() {
diff --git a/app/controllers/collections/detail/edit.js b/app/controllers/collections/detail/edit.js
index 72c586c..df9f0ee 100644
--- a/app/controllers/collections/detail/edit.js
+++ b/app/controllers/collections/detail/edit.js
@@ -11,6 +11,9 @@ export default Controller.extend(ValidationMixin, {
   CollectionSpeciesValidations,
   DatasheetValidations,
 
+  hasMany: ['collectionSpecies', 'datasheets'],
+  safeNavigate: false,
+
   options: computed('projectOptions', 'studyLocationOptions',
                     'collectionTypeOptions', 'collectionMethodOptions',
                     'speciesOptions', 'adfgPermitOptions', function() {
@@ -27,15 +30,21 @@ export default Controller.extend(ValidationMixin, {
   actions: {
     onSave(changesets) {
       const postSave = () => {
+        this.set('safeNavigate', true);
         // Use the model's ID here because of the ArrayProxy in the route
         this.transitionToRoute('collections.detail', this.get('model.id'));
+        this.set('safeNavigate', false);
+        console.log('save');
       };
       return this.validationSave(changesets, postSave);
     },
     onCancel(changesets) {
       const postCancel = () => {
+        this.set('safeNavigate', true);
         // Use the model's ID here because of the ArrayProxy in the route
-        return this.transitionToRoute('collections.detail', this.get('model.id'));
+        this.transitionToRoute('collections.detail', this.get('model.id'));
+        this.set('safeNavigate', false);
+        console.log('cancel');
       };
       return this.validationCancel(changesets, postCancel);
     },
diff --git a/app/mixins/cleanup-form.js b/app/mixins/cleanup-form.js
new file mode 100644
index 0000000..fdf1032
--- /dev/null
+++ b/app/mixins/cleanup-form.js
@@ -0,0 +1,36 @@
+import Ember from 'ember';
+
+const { Mixin, run: { once } } = Ember;
+
+export default Mixin.create({
+  actions: {
+    willTransition(transition) {
+      if (!this.get('controller.safeNavigate')) {
+        if (confirm('Any unsaved changes will be discarded.')) {
+          let model = this.get('controller.model');
+          let hasMany = this.get('controller.hasMany');
+
+          hasMany.forEach((relationship) => {
+            model.get(relationship).forEach((r) => {
+              once(this, () => {
+                if (r.get('isNew')) {
+                  r.deleteRecord();
+                } else {
+                  r.rollbackAttributes();
+                }
+              }, this);
+            });
+          });
+
+          if (model.get('isNew')) {
+            model.deleteRecord();
+          }
+        } else {
+          transition.abort();
+          return false
+        }
+      }
+      return true;
+    },
+  },
+});
diff --git a/app/routes/collections/create.js b/app/routes/collections/create.js
index 2ecd267..cd56f73 100644
--- a/app/routes/collections/create.js
+++ b/app/routes/collections/create.js
@@ -1,8 +1,9 @@
 import Ember from 'ember';
+import CleanupFormMixin from 'ccdb-web/mixins/cleanup-form';
 
 const { Route, RSVP } = Ember;
 
-export default Route.extend({
+export default Route.extend(CleanupFormMixin, {
   model() {
     const store = this.get('store');
     return RSVP.hash({
diff --git a/app/routes/collections/detail/edit.js b/app/routes/collections/detail/edit.js
index fc99b16..6237884 100644
--- a/app/routes/collections/detail/edit.js
+++ b/app/routes/collections/detail/edit.js
@@ -1,8 +1,9 @@
 import Ember from 'ember';
+import CleanupFormMixin from 'ccdb-web/mixins/cleanup-form';
 
 const { Route, RSVP } = Ember;
 
-export default Route.extend({
+export default Route.extend(CleanupFormMixin, {
   model() {
     const store = this.get('store');
     const model = this.modelFor('collections.detail');
diff --git a/config/environment.js b/config/environment.js
index 6132d43..abd9a84 100644
--- a/config/environment.js
+++ b/config/environment.js
@@ -26,6 +26,7 @@ module.exports = function(environment) {
   if (environment === 'development') {
     ENV.APP.API_HOST = 'http://localhost:8000';
     ENV.APP.API_NAMESPACE = 'api/v1';
+    ENV.APP.LOG_TRANSITIONS = true;
   }
 
   if (environment === 'test') {