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How would I go about doing a join with multiple tables properly? I have created a new controller extending codexController. What are the plugins used for? I have been playing with the DbDropDownExtended but am unsure how to properly do a join. When I try and get a column from one table when the main table is another that doesnt have a column by that name I get a db error. It always looks in the main table for all columns.

Code:

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

include("codexcontroller.php");

class Assets extends codexController
{
    function Assets()
    {        
        // Load the CodexController
        codexController::codexController();

        $vars = array(
            "object" => array(
                "class" => "DbDropDown",
                "params" => array(
                    "primary_key" => 'asset_id',
                    "field" => "object",
                    "table" => "assets_relationships"                    
                )
            ),
            "url" => array("class" => "TextDisplay"),
            "id" => array("class" => "TextDisplay")
            );

        $config = array(
                    'db_table' => 'assets', //The name of the table associated with this controller
                    'form_setup' => $vars, //The array that holds our elements
                    'controller_name' => 'Assets', //The name of the controller, so that it can be used when generating the URLs
                    'add_link' => '', // set this to '' to exclude the add button from the page                    
                    'display_fields'=>array('id','url')
                    );
        $this->setConfig($config);
    }
}