diff --git a/orm/Object.php b/orm/Object.php
index 29b7a42..de3845c 100644
--- a/orm/Object.php
+++ b/orm/Object.php
@@ -341,6 +341,9 @@ protected static function _getMultiple(array $ids)
      */
     protected static function _getSingle($column, $value)
     {
+        $initial_column = $column;
+        $initial_value = $value;
+
         $class = get_called_class();
         $definition = self::getDefinition($class);
 
@@ -381,6 +384,11 @@ protected static function _getSingle($column, $value)
             return null;
         }
 
+        // fix bug where old items are not removed from cache if the value of the column changes
+        if ($object->$initial_column != $initial_value) {
+            return null;
+        }
+
         return $object;
     }
 
@@ -417,7 +425,7 @@ public function json($db_field, $json_key = self::JSON_GET, $value = self::JSON_
         if (!$this->_propertyExists($original_field)) {
             $value = $json_key;
             $json_key = $db_field;
-            $db_field = 'data';
+            $db_field = 'json';
         }
 
         if (!$this->_propertyExists($db_field) || ($original_field != $db_field && $original_value !== self::JSON_GET)) {
diff --git a/orm/_manifest.php b/orm/_manifest.php
index f0860c7..91997a8 100644
--- a/orm/_manifest.php
+++ b/orm/_manifest.php
@@ -10,7 +10,7 @@
  */
 class Orm extends Manifest
 {
-    const VERSION = "1.0.2";
+    const VERSION = "1.0.3";
     protected $_dependencies = array('Database', 'Cache');
     protected $_instructions = "Check out http://sonicframework.com/tutorial/orm for help getting started";
 }