custom fields

Hi,

I’ve created 2 columns in wp_posts, post_language and post_project, because i want to view certain posts and media according the session that i passed from another site to the wordpress.

Now, i’ve got a problem in media section. I’m trying to insert a media and give the 2 columns values but i cannot achieve this.
In my plugin i have this one..

function modify_columns( $post_id ) {
	remove_action( 'save_post', 'modify_columns' );
	wp_update_post( array( 'ID' => $post_id, 'post_project' => "".$_SESSION['project']."", 'post_language' => "".$_SESSION['language']."" ) );
	add_action( 'save_post', 'modify_columns' );
}

add_action(‘save_post’, ‘modify_columns’);

function wp_insert_post_data_filter( $data, $postarr ) {
$data[‘post_project’] = $_SESSION[‘project’];
$data[‘post_language’] = $_SESSION[‘language’];
return $data;
}

add_filter( ‘wp_insert_post_data’, ‘wp_insert_post_data_filter’, 10, 2 );

This is in order to pass the values to the 2 columns. This works like a charm in posts and pages section. But in media there is a problem.

Is there anyone that can help me resolve this one?

I forgot to mention that if i placed this code

$data[‘post_project’] = $_SESSION[‘project’];
$data[‘post_language’] = $_SESSION[‘language’];`
in post.php in wp_insert_post function before if ( ‘attachment’ === $post_type ) { it works, but i don’t want to change the core files because if i update the wp, i will lose all my changes.

Please help me resolve this!

Thank you in advance!