group by + array

lib/dialects/mysql/query-generator.js

@@ -159,7 +159,7 @@ module.exports = (function() {
       }
 
       if (options.group) {
-        options.group = Utils.addTicks(options.group)
+        options.group = Array.isArray(options.group) ? options.group.map(function(grp){return Utils.addTicks(grp)}).join(', ') : Utils.addTicks(options.group)
         query += " GROUP BY <%= group %>"
       }
 

lib/dialects/postgres/query-generator.js

@@ -285,7 +285,7 @@ module.exports = (function() {
       }
 
       if(options.group) {
-        options.group = addQuotes(options.group)
+        options.group = Array.isArray(options.group) ? options.group.map(function(grp){return addQuotes(grp)}).join(', ') : addQuotes(options.group)
         query += " GROUP BY <%= group %>"
       }