[Matt Cox]

For the benefit of anyone else attempting to implement this, the above post is incorrect. Buddypress implemented @mention listing by searching the text of all activity updates. The function to query for activity (BP_Activity_Activity:get) allows you to query by user id AND search term, but not user id OR search term, as this feature requires.

The only way I was able to get this working was by hacking bp-activity-classes.php, and updating the user_id sql in the get_filter_sql function. The updated code is as follows:

`if ( !empty( $filter_array ) ) {
$user_filter = explode( ‘,’, $filter_array );
$user_sql = ” ( a.user_id IN ( ” . $filter_array . ” ) “;
foreach ( $user_filter as $user_id ) {
$search_terms = ‘@’ . bp_core_get_username( $user_id ) . ‘<';
$user_sql .= “OR ( a.content LIKE ‘%%”.like_escape($search_terms).”%%’ ) “;
}
$user_sql .= ” ) “;
$filter_sql[] = $user_sql;
}`

If someone has a more elegant solution, please let me know!