Can create a new user

app/pods/application/route.js

@@ -6,5 +6,11 @@ export default Ember.Route.extend(ApplicationRouteMixin, {
     invalidateSession: function() {
       this.get('session').invalidate();
     },
+
+    didTransition: function() {
+      this.get('flashMessages').clearMessages();
+      return true;
+    },
+
   }
 });

app/pods/login/controller.js

@@ -7,6 +7,7 @@ export default Ember.Controller.extend({
       let authenticator = 'simple-auth-authenticator:token';
 
       this.set('loading', true);
+      // Manually clean up because there might not be a transition
       this.get('flashMessages').clearMessages();
       this.get('session').authenticate(authenticator, credentials).then(()=>{
         this.set('loading', false);

app/pods/user/adapter.js

@@ -1,3 +1,4 @@
+import Ember from 'ember';
 import DS from 'ember-data';
 
 export default DS.RESTAdapter.extend({
@@ -6,4 +7,21 @@ export default DS.RESTAdapter.extend({
     return this.get('globals.apiURL');
   }.property(),
   coalesceFindRequests: true,
+  ajaxError: function(jqXHR) {
+    // http://stackoverflow.com/a/24027443
+    var error = this._super(jqXHR);
+    if (jqXHR && jqXHR.status === 422) {
+      var response = Ember.$.parseJSON(jqXHR.responseText),
+        errors = {};
+      if (response.errors !== undefined) {
+        var jsonErrors = response.errors;
+        Ember.EnumerableUtils.forEach(Ember.keys(jsonErrors), function(key) {
+          errors[Ember.String.camelize(key)] = jsonErrors[key];
+        });
+      }
+      return new DS.InvalidError(errors);
+    } else {
+      return error;
+    }
+  }
 });

app/pods/users/new/new-user-form/component.js

@@ -9,7 +9,15 @@ export default Ember.Component.extend({
       var user = this.get('user');
 
       if (user.get('isDirty')) {
-        user.save();
+        user.save().then(() => {
+          this.sendAction();
+        }).catch(() => {
+          // Manually clean up messages because there is no transition
+          this.get('flashMessages').clearMessages();
+          user.get('errors').forEach((error) => {
+            this.get('flashMessages').error(`${error.attribute.capitalize()} - ${error.message}`);
+          });
+        });
       }
     },
   },

app/pods/users/new/route.js

@@ -11,4 +11,12 @@ export default Ember.Route.extend(UnauthenticatedRouteMixin, {
   setupController: function(controller, model) {
     controller.setProperties(model);
   },
+
+  actions: {
+    success: function() {
+      this.transitionTo('login');
+      this.get('flashMessages').information(`You have successfully signed up.
+        Please check your email for further instructions.`);
+    }
+  },
 });

app/pods/users/new/template.hbs

@@ -1 +1 @@
-{{users/new/new-user-form user=user}}
+{{users/new/new-user-form user=user action="success"}}

server/mocks/users.js

@@ -47,7 +47,16 @@ module.exports = function(app) {
   });
 
   usersRouter.post('/', function(req, res) {
-    res.status(201).end();
+    // req.body.user.id = Math.max.apply(Math, USERS.map(function(o){return o.id;})) + 1;
+    // res.status(201).send(req.body);
+    // NOTE - use the following for testing errors
+    res.status(422).send({
+      'errors':{
+        "name": ["Must provide a value"],
+        "email": ["Must provide a value"],
+        "password": ["Must provide a value"],
+      }
+    }).end();
   });
 
   usersRouter.get('/:id', function(req, res) {