Added case and demo for user not found. Should be made prettier as soon as users can be queried by name

app/models/User.coffee

@@ -18,6 +18,9 @@ module.exports = class User extends CocoModel
     permissions = @attributes['permissions'] or []
     return 'admin' in permissions
 
+  isAnonymous: ->
+    @get 'anonymous'
+
   displayName: ->
     @get('name') or 'Anoner'
 

app/templates/kinds/user.jade

@@ -3,10 +3,14 @@ extends /templates/base
 // User pages might have some user page specific header, if not remove this
 block content
   div
-    ol.breadcrumb
-      li
-        - var userName = user.get('name');
-        a(href="/user/#{user.id}") #{userName}
-      li.active
-        | #{currentUserView}
+    if user
+      ol.breadcrumb
+        li
+          - var userName = user.get('name');
+          a(href="/user/#{user.id}") #{userName}
+        li.active
+          | #{currentUserView}
+    else
+      // TODO Ruben make this all fancy as soon as we can query users by name
+      | User not found.
 

app/templates/user/achievements.jade

@@ -1,11 +1,12 @@
 extends /templates/kinds/user
 
 block append content
-  .row
-    each achievement, index in achievements
-      - var title = achievement.get('name');
-      - var description = achievement.get('description');
-      - var imgURL = achievement.get('icon');
-      - var locked = ! achievement.get('unlocked');
-      .col-lg-4.col-xs-12
-        include ../achievement_notify
+  if achievements
+    .row
+      each achievement, index in achievements
+        - var title = achievement.get('name');
+        - var description = achievement.get('description');
+        - var imgURL = achievement.get('icon');
+        - var locked = ! achievement.get('unlocked');
+        .col-lg-4.col-xs-12
+          include ../achievement_notify

app/views/kinds/UserView.coffee

@@ -10,22 +10,30 @@ module.exports = class UserView extends RootView
     super options
 
     @listenTo @, 'userLoaded', @onUserLoaded
+    @listenTo @, 'userNotFound', @ifUserNotFound
 
     # TODO Ruben Assume ID for now
     @user = User.getByID @nameOrID, {}, true,
-      success: =>
-        @trigger 'userLoaded', @user
+      success: (user) =>
+        @trigger 'userNotFound' unless user
+        @trigger 'userLoaded', user
+      error: =>
+        console.debug 'Error while fetching user'
+        @trigger 'userNotFound'
 
   getRenderData: ->
     context = super()
     context.currentUserView = 'Achievements'
-    context.user = @user
+    context.user = @user unless @user?.isAnonymous()
     context
 
   isMe: -> @nameOrID is me.id
 
-  onUserLoaded: ->
-    console.log 'onUserLoaded'
+  onUserLoaded: (user) ->
+    console.log 'onUserLoaded', user
+
+  ifUserNotFound: ->
+    console.warn 'user not found'
 
   onLoaded: ->
     super()

app/views/user/achievements.coffee

@@ -34,6 +34,7 @@ module.exports = class UserAchievementsView extends UserView
 
   getRenderData: ->
     context = super()
-    context.achievements = @achievements.models
-    context.earnedAchievements = @earnedAchievements.models
+    if @user and not @user.isAnonymous()
+      context.achievements = @achievements.models
+      context.earnedAchievements = @earnedAchievements.models
     context

test/demo/views/user/UserNotFound.demo.coffee

@@ -0,0 +1,9 @@
+UserAchievementsView = require 'views/user/achievements'
+
+module.exports = ->
+  view = new UserAchievementsView {}, 'thisiddoesntexist'
+
+  userRequest = jasmine.Ajax.requests.mostRecent()
+  userRequest.response status: 404
+
+  view.render()