Last updated February 6, 2012. Created by StuartDH on February 4, 2012.
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With roles, users, forum structure and threads migrated, we can now add posts to the threads with something like...

<?php
class vBulletinPostMigration extends Migration {
  public function
__construct() {
   
parent::__construct();
   
$this->description = t('Migrate vBulletin forum posts');
   
// Set the source table's primary key
   
$this->map = new MigrateSQLMap(
     
$this->machineName,
      array(
       
'postid' => array(
         
'type' => 'int',
         
'unsigned' => TRUE,
         
'not null' => TRUE,
         
'description' => 'vBulletin forum posts',
         
'alias' => 'p',
        ),
      ),
     
MigrateDestinationNode::getKeySchema(),
     
'for_forum_migration'
   
);
   
// Set the query to get the source object
   
$query = Database::getConnection('default', 'for_forum_migration')
      ->
select('post', 'p')
      ->
fields('p', array(
       
'postid',
       
'threadid',
       
'parentid',
       
'username',
       
'userid',
       
'title',
       
'dateline',
       
'pagetext',
       
'allowsmilie',
       
'showsignature',
       
'ipaddress',
       
'iconid',
       
'visible',
       
'attach',
       
'infraction',
       
'reportthreadid',
        ));
   
// D7 thread includes the first post as it's body, so join with the post table and do not the first post for each thread
   
$query->join('thread', 't', 't.threadid = p.threadid AND p.postid != t.firstpostid');
   
// This sort ensures that post parents are saved before children.
   
$query->orderBy('dateline', 'ASC');
   
$count_query = Database::getConnection('default', 'for_forum_migration')
                ->
select('post', 'p');
   
$count_query->addExpression('COUNT(postid)', 'cnt');
   
$this->source = new MigrateSourceSQL($query, array(), $count_query, array('map_joinable' => FALSE));
   
// Define the destination as the D7 comment
   
$this->destination = new MigrateDestinationComment('comment_node_forum');
   
// Map fields from vBulletin posts to D7 forum comments
   
$this->addFieldMapping('nid', 'threadid')
         ->
sourceMigration('vBulletinThread');
   
$this->addFieldMapping('name', 'username');
   
$this->addFieldMapping('uid', 'userid')
         ->
sourceMigration('vBulletinUser');
   
$this->addFieldMapping('thread', 'title')
         ->
sourceMigration('vBulletinThread')
         ->
defaultValue(NULL);
   
$this->addFieldMapping('subject', 'title')
         ->
defaultValue(NULL);
   
$this->addFieldMapping('created', 'dateline');
   
$this->addFieldMapping('changed', 'dateline');
   
$this->addFieldMapping('status', 'visible');
   
$this->addFieldMapping('hostname', 'ipaddress');
   
$this->addFieldMapping('comment_body', 'pagetext');
   
//Do not map the following source fields
   
$this->addFieldMapping(NULL, 'allowsmilie') ->description(t('Not a setting per comment in D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping(NULL, 'showsignature') ->description(t('Set at roles level in D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping(NULL, 'iconid') ->description(t('Not used in vBulletin or D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping(NULL, 'attach') ->description(t('Set at content type level in D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping(NULL, 'infraction') ->description(t('Not used in vBulleton or D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping(NULL, 'reportthreadid') ->description(t('Not used in D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping(NULL, 'parentid') ->description(t('No parentid as I want thread posts to be linear rather than threaded in D7'))
           ->
issueGroup(t('DNM'));
   
// Unmapped destination fields
   
$this->addFieldMapping('pid') ->description(t('Want linear rather than threaded threads so pid not used in D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping('mail') ->description(t('No anonymous comments in vBulletin and email set at user level in D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping('homepage') ->description(t('No anonymous comments in vBulletin and homepage set at user level in D7'))
           ->
issueGroup(t('DNM'));
   
$this->addFieldMapping('language') ->description(t('Language set at site level in D7'))
           ->
issueGroup(t('DNM'));
  }
   
// D7 comment subject titles need to be trimmed to a max of 50 characters
 
public function prepareRow(stdClass $row) {
    if (
drupal_strlen($row->title) > 50) {
     
$row->title = drupal_substr($row->subject, 0, 50) . '...';
    }
  }
}
?>

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