RTMediaActivityModel::get PHP Method

    function get($columns, $offset = false, $per_page = false, $order_by = 'activity_id DESC')
    {
        $columns['blog_id'] = get_current_blog_id();
        return parent::get($columns, $offset, $per_page, $order_by);
    }

 /**
  * Update `bp_latest_update` user meta with lasted public update.
  *
  * @param $content
  * @param $user_id
  * @param $activity_id
  */
 function manage_user_last_activity_update($content, $user_id, $activity_id)
 {
     global $wpdb, $bp;
     // do not proceed if not allowed
     if (!apply_filters('rtm_manage_user_last_activity_update', true, $activity_id)) {
         return;
     }
     $rtm_activity_model = new RTMediaActivityModel();
     $rtm_activity_obj = $rtm_activity_model->get(array('activity_id' => $activity_id));
     if (!empty($rtm_activity_obj)) {
         if (isset($rtm_activity_obj[0]->privacy) && $rtm_activity_obj[0]->privacy > 0) {
             $get_columns = array('activity_id' => array('compare' => '<', 'value' => $activity_id), 'user_id' => $user_id, 'privacy' => array('compare' => '<=', 'value' => 0));
             // get user's latest public activity update
             $new_last_activity_obj = $rtm_activity_model->get($get_columns, 0, 1);
             if (!empty($new_last_activity_obj)) {
                 // latest public activity id
                 $public_activity_id = $new_last_activity_obj[0]->activity_id;
                 // latest public activity content
                 $activity_content = bp_activity_get_meta($public_activity_id, 'bp_activity_text');
                 if (empty($activity_content)) {
                     $activity_content = $wpdb->get_var("SELECT content FROM {$bp->activity->table_name} WHERE id = {$public_activity_id}");
                 }
                 $activity_content = apply_filters('bp_activity_latest_update_content', $activity_content, $activity_content);
                 // update user's latest update
                 bp_update_user_meta($user_id, 'bp_latest_update', array('id' => $public_activity_id, 'content' => $activity_content));
             }
         }
     }
 }