Loading a model inside a model

[eluser]robmcm[/eluser]
Hi,

I would like to have a model, that loads in various different models.

For example if you had a car model, it would load in the engine model, wheel model, interior model etc etc

The problem I have is codeigniter doesn't seem to allow me to load a model inside a model.

So when inside my car model, if I do the following:

Code:

$this->load->model('Engine_model', '', TRUE);
$this->engine = $this->Engine_model->load_from_id( $this->engineIdFk );

I get this error:

Code:

A PHP Error was encountered

Severity: Notice

Message: Undefined property: Car_model::$Engine_model

Filename: models/car_model.php

Line Number: 123

Is there a different way to load a model, or should my Car_model not really be a model, or at lease extend the codeigniter Model class?

Thanks

Rob