[fw-general] [ZF2] Select question

[Xander Guzman]

        $select = $this->getSql()->select();
        $where  = $this->getWhere()
            ->equalTo('campaign_id', $campaign->getId())
            ->between(new DbExpression('NOW()'), 'start_date', 'end_date');

        $select->from('funding_round')
            ->columns(
                array(
                    'funding_round_id',
                    'campaign_id',
                    'start_date',
                    'end_date',
                    'pledge_goal',
                    'created',
                )
            )
            ->where($where);

Produces:

SELECT `funding_round`.`funding_round_id` AS `funding_round_id`,
`funding_round`.`campaign_id` AS `campaign_id`,
`funding_round`.`start_date` AS `start_date`, `funding_round`.`end_date` AS
`end_date`, `funding_round`.`pledge_goal` AS `pledge_goal`,
`funding_round`.`created` AS `created` FROM `funding_round` WHERE
`campaign_id` = '4' AND BETWEEN 'start_date' AND 'end_date'

The part that's incorrect is

*AND BETWEEN 'start_date' AND 'end_date' *
*
*
should be

*AND NOW() BETWEEN 'start_date' AND 'end_date'*
*
*
But I'm not sure if it's my misuse of the class or a bug, help?