Fix an issue with multiple group by columns

README.md

@@ -2,6 +2,8 @@
 
 A node query builder for various SQL databases, based on CodeIgniter's query builder.
 
+[![Build Status](https://travis-ci.org/timw4mail/node-query.svg?branch=master)](https://travis-ci.org/timw4mail/node-query)
+
 ### Basic use
 
 	var nodeQuery = require('node-query');

docs/index.html

@@ -93,6 +93,7 @@
 
     <section class="readme-section">
         <article><h1>Node-query</h1><p>A node query builder for various SQL databases, based on CodeIgniter's query builder.</p>
+<p><a href="https://travis-ci.org/timw4mail/node-query"><img src="https://travis-ci.org/timw4mail/node-query.svg?branch=master" alt="Build Status"></a></p>
 <h3>Basic use</h3><pre class="prettyprint source"><code>var nodeQuery = require('node-query');
 
 var connection = ... // Database module connection 

lib/query-builder.js

@@ -273,8 +273,8 @@ var QueryBuilder = function(driver, adapter) {
 			{
 				sql = _p.compile(type, table);
 			}
-//console.log(sql);
-//console.log('------------------------');
+console.log(sql);
+console.log('------------------------');
 
 			if ( ! vals)
 			{
@@ -621,10 +621,10 @@ var QueryBuilder = function(driver, adapter) {
 	 * @return this
 	 */
 	this.groupBy = function(field) {
-		if (Array.isArray(field))
+		if ( ! helpers.isScalar(field))
 		{
 			var newGroupArray = field.map(driver.quoteIdentifiers);
-			state.groupArray.concat(newGroupArray);
+			state.groupArray = state.groupArray.concat(newGroupArray);
 		}
 		else
 		{

tests/query-builder-base.js

@@ -185,7 +185,8 @@ module.exports = (function()  {
 					.from('create_test')
 					.where('id >', 0)
 					.where('id <', 9000)
-					.groupBy('id')
+					.groupBy('k')
+					.groupBy(['id', 'val'])
 					.orderBy('id', 'DESC')
 					.orderBy('k', "ASC")
 					.limit(5, 2)