Introduced findBySlugOrId to fix a bug

server/lib/utils.coffee

@@ -0,0 +1,3 @@
+
+module.exports =
+  isID: (id) -> _.isString(id) and id.length is 24 and id.match(/[a-f0-9]/gi)?.length is 24

server/plugins/plugins.coffee

@@ -1,6 +1,7 @@
 mongoose = require('mongoose')
 textSearch = require('mongoose-text-search')
 log = require 'winston'
+utils = require '../lib/utils'
 
 module.exports.MigrationPlugin = (schema, migrations) ->
   # Property name migrations made EZ
@@ -31,9 +32,13 @@ 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) ->
+  schema.statics.findBySlug = (slug, done) ->
     @findOne {slug: slug}, done
 
+  schema.statics.findBySlugOrId = (slugOrID, done) ->
+    return @findById slugOrID, done if utils.isID slugOrID
+    @findOne {slug: slugOrID}, done
+
   schema.pre('save', (next) ->
     if schema.uses_coco_versions
       v = @get('version')

server/users/user_handler.coffee

@@ -208,7 +208,7 @@ UserHandler = class UserHandler extends Handler
           @sendSuccess(res, {result: 'success'})
 
   avatar: (req, res, id) ->
-    @modelClass.findById(id).exec (err, document) =>
+    @modelClass.findBySlugOrId(id).exec (err, document) =>
       return @sendDatabaseError(res, err) if err
       return @sendNotFoundError(res) unless document
       photoURL = document?.get('photoURL')
@@ -232,7 +232,7 @@ UserHandler = class UserHandler extends Handler
 
   IDify: (idOrSlug, done) ->
     return done null, idOrSlug if Handler.isID idOrSlug
-    User.getBySlug idOrSlug, (err, user) -> done err, user?.get '_id'
+    User.findBySlug idOrSlug, (err, user) -> done err, user?.get '_id'
 
   getLevelSessions: (req, res, userIDOrSlug) ->
     @IDify userIDOrSlug, (err, userID) =>