Have a go at some error handling

Still not happy with how this is all fitting together. But good enough
for now

framework/core/ember/app/adapters/application.js

@@ -25,12 +25,17 @@ export default JsonApiAdapter.extend({
     // If it's a server error, show an alert message. The alerts controller
     // has been injected into this adapter.
     if (errors instanceof JsonApiAdapter.ServerError) {
-      var message = AlertMessage.create({
+      var message;
+      if (errors.status === 401) {
+        message = 'You don\'t have permission to do this.';
+      } else {
+        message = errors.message;
+      }
+      var alert = AlertMessage.create({
         type: 'warning',
-        message: 'Something went wrong: '+errors.message.errors[0].code
+        message: message
       });
-      this.get('alerts').send('alert', message);
-      return;
+      this.get('alerts').send('alert', alert);
     }
 
     return errors;

framework/core/ember/app/controllers/discussion.js

@@ -76,15 +76,19 @@ export default Ember.Controller.extend(Ember.Evented, UseComposerMixin, {
     reply: function() {
       var discussion = this.get('model');
       var controller = this;
-      this.showComposer(function() {
-        return ComposerReply.create({
-          user: controller.get('session.user'),
-          discussion: discussion,
-          submit: function(data) {
-            controller.saveReply(discussion, data);
-          }
+      if (this.get('session.isAuthenticated')) {
+        this.showComposer(function() {
+          return ComposerReply.create({
+            user: controller.get('session.user'),
+            discussion: discussion,
+            submit: function(data) {
+              controller.saveReply(discussion, data);
+            }
+          });
         });
-      });
+      } else {
+        this.send('signup');
+      }
     },
 
     // This action is called when the start position of the discussion

framework/core/ember/app/controllers/index.js

@@ -24,8 +24,10 @@ export default Ember.Controller.extend(UseComposer, Paneable, {
 
     var controller = this;
     return this.saveAndDismissComposer(discussion).then(function(discussion) {
-      controller.get('index').send('loadResults');
-      controller.transitionToRoute('discussion', discussion);
+      if (discussion) {
+        controller.get('index').send('loadResults');
+        controller.transitionToRoute('discussion', discussion);
+      }
     });
   },
 
@@ -46,14 +48,18 @@ export default Ember.Controller.extend(UseComposer, Paneable, {
 
     newDiscussion: function() {
       var controller = this;
-      this.showComposer(function() {
-        return ComposerDiscussion.create({
-          user: controller.get('session.user'),
-          submit: function(data) {
-            controller.saveDiscussion(data);
-          }
+      if (this.get('session.isAuthenticated')) {
+        this.showComposer(function() {
+          return ComposerDiscussion.create({
+            user: controller.get('session.user'),
+            submit: function(data) {
+              controller.saveDiscussion(data);
+            }
+          });
         });
-      });
+      } else {
+        this.send('signup');
+      }
     },
 
     discussionRemoved: function(discussion) {

framework/core/ember/app/views/discussion.js

@@ -62,7 +62,7 @@ export default Ember.View.extend(HasItemLists, {
   populateControls: function(items) {
     var view = this;
 
-    this.addActionItem(items, 'reply', 'Reply', 'reply', 'discussion.canReply', function() {
+    this.addActionItem(items, 'reply', 'Reply', 'reply', null, function() {
       view.get('streamContent').send('goToLast');
       view.get('controller').send('reply');
     });