I have created migrations for most of my D6 site to a new D7 site. In the D6 site I have users with profile nodes. Those profile nodes are linked to another type of node via node reference. In D7 the other node will be an organic group.

I would like to be able to transfer the node reference relationship in D6 to organic group membership in D7. Has anyone done this?

Thanks in advance for any help given.


I ended up using the advanced method as described in the semi-official documentation (https://drupal.org/node/2023273). It all came down to modifying the query to get the nid and new group nid.

class MemberCompanyMembershipMigration extends DrupalMigration {
     * Construct a migration.
     * @param array $args
     *   Constructor arguments passed at migration-registration time.
    public function __construct($args) {


        // Set the fields we want; document in the UI.

        $this->sourceFields += array(
                'nid' => t('Group node ID.'),
                'is_active' => t('User status in the group.'),
                'is_admin' => t('Group admin or not.'),
                'uid' => t('User ID.'),
        $this->sourceOptions['map_joinable'] = FALSE;
        // Set the query as the migration source.
        $this->source = new MigrateSourceSQL(
                $this->query(), $this->sourceFields, NULL, $this->sourceOptions
        // Map source rows to destination rows with uid+gid.
        $this->map = new MigrateSQLMap($this->machineName,
                        'field_contact_member_company_nid' => array(
                                'type' => 'int',
                                'not null' => TRUE,
                                'description' => 'ID of the group.',
                        'uid' => array(
                                'type' => 'int',
                                'not null' => TRUE,
                                'description' => 'ID of the user.',
        // Destination is group membership.
        $this->destination = new MigrateDestinationOGMembership();
        // Field mappings.
        // Let the user migration map the uids.
        $this->addFieldMapping('etid', 'uid')
        $this->addFieldMapping('state', 'is_active');
        $this->addFieldMapping('is_admin', 'is_admin');
        // Group migration maps the gid via the OG Node migration.
        $this->addFieldMapping('gid', 'field_contact_member_company_nid')
        // Minimal source config means we just set a default
        // instead of looking for roles to map.
        // Accept defaults for these destination fields.
        $no_input = array(
        $this->addUnmigratedDestinations($no_input, t('Do Not Migrate'));
     * Query for the source group data.
     * @return QueryConditionInterface
     *   Provides a connection and query for getting OGMembership records.
    protected function query() {
        $query = Database::getConnection('click2', $this->sourceConnection)
        ->fields('p', array('field_contact_member_company_nid'));
        $query->join('node','n','n.vid = p.vid');
        $query->addField('n', 'uid');
        return $query;
    public function prepareRow($row) {
        if (parent::prepareRow($row) === FALSE) {
            return FALSE;

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