From 2e262c7c54154f520a1c984c5c7a07d13f98639c Mon Sep 17 00:00:00 2001
From: Zaid Abdulla <zkam83@gmail.com>
Date: Thu, 27 Feb 2014 15:05:40 +0300
Subject: [PATCH] Properly return errors from mapReduce function for alias
 compliation

---
 parameters.coffee | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/parameters.coffee b/parameters.coffee
index d6ff338..2ae0030 100644
--- a/parameters.coffee
+++ b/parameters.coffee
@@ -168,6 +168,10 @@ compileAliases = (callback) ->
       }
 
       db.devicesCollection.mapReduce(map, reduce, options, (err, out) ->
+        if err
+          callback?(err)
+          return callback = null
+
         for o in out
           alias = config.PARAMETERS[o.value].alias
           aliases[alias] ?= []
@@ -176,7 +180,7 @@ compileAliases = (callback) ->
             aliases[alias].push(id)
 
         if ++counter == batches.length
-          callback(err, aliases, config.ALIASES_CACHE)
+          callback?(null, aliases, config.ALIASES_CACHE)
       )
     return
   )