From 8da106169e12db12543d5f03c26e59de8a3a7c90 Mon Sep 17 00:00:00 2001
From: xtreme8888 <info@pcfocus.com.au>
Date: Thu, 10 Nov 2016 09:24:32 +1100
Subject: [PATCH] Sorting for appendToSelectStr field DB error

Ordering by appendToSelectStr field causing DB error in Codeigniter 3.1.0, haven't tested on other version.

Resolution:

To use original colname with removed $. should do the trick.
Current version uses $colName = $customExpArray[$aliasKey]; causing DB append sorting method to end of each concat individual value
---
 libraries/Datatable.php | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/libraries/Datatable.php b/libraries/Datatable.php
index d7f2363..297702a 100644
--- a/libraries/Datatable.php
+++ b/libraries/Datatable.php
@@ -213,12 +213,7 @@ public function datatableJson($formats = array(), $debug = FALSE)
                 $colName = $columnIdxArray[$o['column']];
                 //handle custom sql expressions/subselects
                 if (substr($colName, 0, 2) === '$.') {
-                    $aliasKey = substr($colName, 2);
-                    if (isset($customExpArray[$aliasKey]) === FALSE) {
-                        throw new Exception('Alias[' . $aliasKey . '] Could Not Be Found In appendToSelectStr() Array');
-                    }
-
-                    $colName = $customExpArray[$aliasKey];
+                    $colName = substr($colName, 2);
                 }
                 $this->CI->db->order_by($colName, $o['dir']);
             }
@@ -457,4 +452,4 @@ public function whereClauseArray();
 }
 
 // END Datatable Class
-/* End of file Datatable.php */
\ No newline at end of file
+/* End of file Datatable.php */