Mysidia Adoptables Support Forum - Subtract currency upon adopting

Nope, still refuses to work (though that tip does make sense, thank you!)
PHP Code:

		
			
<?php

use Resource\Native\Integer;
use Resource\Native\String;
use Resource\Native\Arrays;
use Resource\Native\Null;

class MaoController extends AppController{

    public function __construct(){
        parent::__construct("member");
        $mysidia = Registry::get("mysidia");
        if($mysidia->usergroup->getpermission("canadopt") != "yes"){
            throw new NoPermissionException("permission");
        }    
    }
    
    public function index(){ 
        $mysidia = Registry::get("mysidia");         
        if($mysidia->input->post("submit")){ 
            $this->access = "member"; 
            $this->handleAccess(); 
            $id = $mysidia->input->post("id"); 
            if($mysidia->session->fetch("adopt") != 1 or !$id) throw new InvalidIDException("global_id");             
             
            $adopt = new Adoptable($id); 
            $conditions = $adopt->getConditions(); 
            if(!$conditions->checkConditions()) throw new NoPermissionException("condition"); 
             
            $name = (!$mysidia->input->post("name"))?"Unnamed":$mysidia->input->post("name"); 
            $alts = $adopt->getAltStatus(); 
            $code = $adopt->getCode(); 
            $gender = $adopt->getGender(); 
            $mysidia->db->insert("owned_adoptables", array("aid" => NULL, "type" => $adopt->getType(), "name" => $name, "owner" => $mysidia->user->username, "currentlevel" => 0, "totalclicks" => 0, "code" => $code,  
                                                           "imageurl" => NULL, "usealternates" => $alts, "tradestatus" => 'notfortrade', "isfrozen" => 'no', "gender" => $gender, "offsprings" => 0, "lastbred" => 0, "originalowner" => $mysidia->user->username, "birthday" => date("F jS, Y")  )); 
            $cost = $mysidia->db->select("adoptables", array("cost"), "type='{$adopt->getType()}'")->fetchColumn();
            $mysidia->user->changecash(-$cost);               
            $aid = $mysidia->db->select("owned_adoptables", array("aid"), "code='{$code}' and owner='{$mysidia->user->username}'")->fetchColumn(); 
            $this->setField("aid", new Integer($aid)); 
            $this->setField("name", new String($name));             
            $this->setField("eggImage", new String($adopt->getEggImage()));  
            return;
        }  
        
        $mysidia->session->assign("adopt", 1, TRUE);
        $ids = $mysidia->db->select("adoptables", array("id"), "shop='Mao Cats'")->fetchAll(PDO::FETCH_COLUMN);
        $total = ($ids)?count($ids):0;
        
        if($total == 0) $adopts = new Null;
        else{        
            $adopts = new Arrays($total);
            $available = 0;
            
            foreach($ids as $id){
                $adopt = new Adoptable($id);
                $conditions = $adopt->getConditions();    
                  if($conditions->checkConditions()) $adopts[$available++] = $adopt;    
            }
            
            if($available == 0) $adopts = new Null;
            else $adopts->setSize($available);            
        }        
        if($adopts instanceof Null) throw new InvalidActionException("adopt_none");
        $this->setField("adopts", $adopts);
    }
}
?>
Don't know what I'm doing wrong at this point @_@