Datamapper ORM Join Help!

[eluser]jordanarseno[/eluser]
I need help constructing a Datamapper ORM query that includes join fields.
I have a table of Merchants and a table of Vendors.
They have a many-to-one relationship, that is, many Merchants are part of a single Vendor.

Thus, my datebase tables, following the Datamapper ORM convention are:

merchants

vendors

merchants_vendors

Furthermore, in the merchants_vendors table, I have join fields 'role' and 'admin'.
Obviously, this data must be placed in the join table, if it were placed in the Merchants table, I wouldn't be able to define roles and administrators per Vendor.

Lastly, Merchants are related to Users by a one-to-one relationship.
Think of Merchants as just an extension of Users.

I'm attempting to create a PHP array from the data that follows this data structure, but I can't seem to get the role and admin fields populating properly. I removed redundant columns for your simplicity:

Code:

[vendor] => Array
            (
                [id] => 1
                [name] => Vendor1
                [users] => Array
                    (
                        [0] => Array
                            (
                                [id] => 277
                                [username] => merchant1
                                [firstname] => Merchant1
                                [merchant] => Array
                                    (
                                        [id] => 1
                                        [user_id] => 277
                                        [role] => Sales
                                        [admin] => 0
                                    )
    
                            )
    
                        [1] => Array
                            (
                                [id] => 282
                                [username] => merchant2
                                [firstname] => Merchant2
                                [merchant] => Array
                                    (
                                        [id] => 2
                                        [user_id] => 282
                                        [role] => Software
                                        [admin] => 1
                                    )
    
                            )
    
                    )
    
            )

Here's the code I'm using - Assuming we know the Vendor ID:

Code:

$v = new Vendor($id);
if($v->exists())
{
   $d['vendor'] = $v->to_array();
   $m = new Merchant();
   $m->where_related_vendor('id', $v->id)->get();
   if($m->exists())
   {
      foreach($m as $mK => $mV)
      {  
         $u = new User();
         $u->where_related_merchant('id', $mV->id)->get();
         $d['vendor']['users'][$mK] = $u->to_array();
         $d['vendor']['users'][$mK]['merchant'] = $mV->to_array();
      }
   }
}
$this->load->view('myview', $d);

This gets me as far as the above PHP data structure without the role and admin.
I am well aware of the include_join_fields() function - but I cannot seem to get it working. Specifically, I tried

Code:

$m->vendor->include_join_fields();

Then tried to access the role/admin fields by

Code:

$mV->vendor->join_role

and

Code:

$mV->vendor->join_admin

- but that doesn't work.

Your help is much appreciated - I also posted this question on StackOverflow, if you wish to get some cred over there too!