Extending AppModel

Hi,
I have an app. It has to get data from two different sources, a mysql
db and an XML API

For the API model I want to be able to do the following:

TriadAPI - extends AppModel contains generic query and connection info
Subscriber - extends TriadAPI and contains subscriber specific queries

I am also using a data source called soap_source.

The problem I have is that I dont have any idea where to put the
TriadAPI file so that it gets loaded. The reason I want to do this is
that I dont want to repeat the generic query and connection info. It
makes senses to me that the hierarchy should look like this:

AppModel -> TriadAPI -> Subscriber

I cant modify AppModel as that will screw up the models that need to
use the DB. At least I think thats that would happen. I have pasted my
model classes below for reference. Thanks for any advice.

/app/models/triad_api.php
class TriadApi extends AppModel
{
/**
* @var useDbConfig
* @description The name of the DataSource connection that this
Model uses. Defined in core/database.php
*/
public $useDbConfig = 'soap';
public $useTable = false;

public $TransactionParams = array ();

public function __construct()
{
parent::__construct();

$api_config = Configure::read('API');

$this->TransactionParams['loginName'] = $api_config
['loginName'];
$this->TransactionParams['loginPassword'] = $api_config
['loginPassword'];
$this->TransactionParams['orgName'] = $api_config['orgName'];

$this->TransactionParams['transaction']['id'] = date('d-m-y-
i:s:a').' - ';
$this->TransactionParams['transaction']['wait'] = $api_config
['wait'];
$this->TransactionParams['transaction']['version'] =
$api_config['version'];
$this->TransactionParams['transaction']
['TransactionCommandList'] = array ();
}

public function formatResult($result)
{
return $result->transactionResult;
}

public function queryDatabase()
{
//stub
}
}

/app/models/subscriber.php
class Subscriber extends TriadApi
{
public function __construct()
{
parent::__construct();
}

public function QuerySub($SubscriberId)
{
$this->TransactionParams['transaction']['id'].'QuerySub';
$this->TransactionParams['transaction']
['TransactionCommandList']['TransactionCommand']['QuerySub']
['SubscriberId'] = $SubscriberId;
return $this->formatResult($this->query('SendTransaction',
$this->TransactionParams));
}

/*
* <QuerySubNRC>
* <SubscriberId> subscriber_id </SubscriberId>
* </QuerySubNRC>
*/
public function QuerySubNRC($SubscriberId)
{
$this->TransactionParams['transaction']['id'].'QuerySubNRC';
$this->TransactionParams['transaction']
['TransactionCommandList']['TransactionCommand']['QuerySubNRC']
['SubscriberId'] = $SubscriberId;
return $this->formatResult($this->query('SendTransaction', $this-
>TransactionParams));
}

/*
* <PerformSubOp>
* <SubscriberId> subscriber_id </SubscriberId>
* <Operation> operation </Operation>
* </PerformSubOp>
*/
public function PerformSubOp($SubscriberId)
{
$this->TransactionParams['transaction']['id'].'PerformSubOp';
$this->TransactionParams['transaction']
['TransactionCommandList']['TransactionCommand']['PerformSubOp']
['SubscriberId'] = $SubscriberId;
$this->TransactionParams['transaction']
['TransactionCommandList']['TransactionCommand']['PerformSubOp']
['Operation'] = 'Refresh';
return $this->query('SendTransaction', $this-
>TransactionParams);
}
}

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