app_controller.php

        $this->loadModel('RoundLength');
        $this->set('round_lengths', $this->RoundLength->find('list'));

round_length.php

	var $hasMany = array(
		'Round' => array(
			'className' => 'Round',
			'foreignKey' => 'round_length_id',
			'dependent' => false,
			'conditions' => '',
			'fields' => '',
			'order' => '',
			'limit' => '',
			'offset' => '',
			'exclusive' => '',
			'finderQuery' => '',
			'counterQuery' => ''
		)
	);

rounds.php

    var $belongsTo = array(
        'RoundLength' => array(
            'className' => 'RoundLength',
            'foreignKey' => 'round_length_id',
            'conditions' => '',
            'fields' => '',
            'order' => ''
        )
    );

view.ctp

        <?php
            //debug($round_lengths); //this debug shows an array of my round lengths
            $session->flash();
            echo $this->Form->create('Round', array('action' => 'add'), array('class' => 'mini-form'));
            echo $this->Form->input('round_length_id'); //this keeps coming up as an empty select list
            echo $this->Form->end('Start Round');
        ?>