/**
* This constructor initializes the class.
*
* @access public
* @param DB_ORM_Model $model a reference to the implementing model
* @param string $field the name of field in the database table
* @throws Throwable_InvalidArgument_Exception indicates that an invalid field name
* was specified
*/
public function __construct(DB_ORM_Model $model, $field)
{
if (!is_string($field) or $model->is_adaptor($field) or $model->is_alias($field) or !$model->is_field($field) or $model->is_relation($field)) {
throw new Throwable_InvalidArgument_Exception('Message: Invalid field name defined. Reason: Field name either is not a field or is already defined.', array(':field' => $field));
}
$this->model = $model;
$this->metadata['field'] = $field;
}
