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-rw-r--r--system/database/DB_forge.php8
1 files changed, 7 insertions, 1 deletions
diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
index dde285598..f9cf76a14 100644
--- a/system/database/DB_forge.php
+++ b/system/database/DB_forge.php
@@ -239,7 +239,13 @@ abstract class CI_DB_forge {
*/
public function add_key($key, $primary = FALSE)
{
- if (is_array($key))
+ // DO NOT change this! This condition is only applicable
+ // for PRIMARY keys because you can only have one such,
+ // and therefore all fields you add to it will be included
+ // in the same, composite PRIMARY KEY.
+ //
+ // It's not the same for regular indexes.
+ if ($primary === TRUE && is_array($key))
{
foreach ($key as $one)
{