fix: Entity's primary key is cast when inserting

Author: kenjis

system/Model.php

@@ -798,6 +798,20 @@ protected function objectToRawArray($data, bool $onlyChanged = true, bool $recur
                 && ! empty($data->{$this->primaryKey})
             )
         ) {
+            // For Entity
+            if (method_exists($data, 'cast')) {
+                // Disable Entity cast, because raw data is needed for database.
+                $cast = $data->cast();
+                $data->cast(false);
+
+                $properties[$this->primaryKey] = $data->{$this->primaryKey};
+
+                // Restore Entity cast setting.
+                $data->cast($cast);
+
+                return $properties;
+            }
+
             $properties[$this->primaryKey] = $data->{$this->primaryKey};
         }