accessing a function in a custom datasource, from the model

Hello,

In CakePHP 1.3, how do I use a function in a custom datasource, from a
model that uses that datasource?

My custom datasource works for regular queries, but I want to extend
the default "find" method to include a new parameter. In app/models/
datasources/foofiles_source.php I have a function to find video files
on the filesystem. For testing, it is:

class FoofilesSource extends DataSource {

public function find_videos($videoQuery) {
return(array("This is in the foo_files datasource!",
"w00t!"));
}
…

In the FooFiles model, I have:

function find($type, $options = array()) {
switch($type) {
case "videos":
$this->find_videos($options);
break;

default:
return parent::find($type, $options);
break;
}
}

However, $this->find_videos($options) produces a fatal error:
Fatal error: Call to undefined method FoofilesSource::query() in cake/
libs/model/model.php on line 502

If I use FoofilesSource::find_videos($options) instead, I get the
error:
Fatal error: Class 'FooFilesSource' not found in app/models/
foo_files.php on line 11

How do I invoke a function in the datasource, from a model?

Thanks!

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