First step towards fetching related by slug

server/plugins/plugins.coffee

@@ -30,6 +30,10 @@ module.exports.NamedPlugin = (schema) ->
   schema.add({name: String, slug: String})
   schema.index({'slug': 1}, {unique: true, sparse: true, name: 'slug index'})
 
+  schema.statics.getBySlug = (slug, done) ->
+    @findOne {slug: slug}, (err, doc) ->
+      if err then done err else done doc
+
   schema.pre('save', (next) ->
     if schema.uses_coco_versions
       v = @get('version')

server/users/user_handler.coffee

@@ -239,8 +239,15 @@ UserHandler = class UserHandler extends Handler
       documents = (LevelSessionHandler.formatEntity(req, doc) for doc in documents)
       @sendSuccess(res, documents)
 
-  getLevelSessions: (req, res, userID) ->
+  IDify: (idOrSlug, done) ->
-    query = creator: userID
+    if Handler.isID idOrSlug
+      done idOrSlug
+    else
+      User.getBySlug idOrSlug, (user) -> done user?.get '_id'
+
+  getLevelSessions: (req, res, userIDOrSlug) ->
+    @IDify userIDOrSlug, (userID) =>
+      query = creator: userID + ''
       isAuthorized = req.user._id+'' is userID or req.user.isAdmin()
       projection = {}
       if req.query.project
@@ -253,14 +260,14 @@ UserHandler = class UserHandler extends Handler
         documents = (LevelSessionHandler.formatEntity(req, doc) for doc in documents)
         @sendSuccess(res, documents)
 
-  getEarnedAchievements: (req, res, userID) ->
+  getEarnedAchievements: (req, res, userIDOrSlug) ->
-    queryObject = {$query: {user: userID}, $orderby: {changed: -1}}
+    @IDify userIDOrSlug, (userID) =>
-    queryObject.$query.notified = false if req.query.notified is 'false'
+      query = user: userID + ''
-    query = EarnedAchievement.find(queryObject)
+      query.notified = false if req.query.notified is 'false'
-    query.exec (err, documents) =>
+      EarnedAchievement.find(query).sort(changed: -1).exec (err, documents) =>
         return @sendDatabaseError(res, err) if err?
         cleandocs = (@formatEntity(req, doc) for doc in documents)
-      for doc in documents  # Maybe move this logic elsewhere
+        for doc in documents  # TODO Ruben Maybe move this logic elsewhere
           doc.set('notified', true)
           doc.save()
         @sendSuccess(res, cleandocs)