搜索主键时，CakePhp2搜索表单从post切换到not post

<?php echo $this->Form->create('ModelName', array('type' => 'get')); ?>
<?php echo $this->Form->input('keyword', array('label' => 'Search')); ?>
<?php echo $this->Form->submit('Submit'); ?>
<?php echo $this->Form->end(); ?>

public function index() {
    if ($this->request->is('get')) {
        $keyword = $this->request->query('keyword');
        // 执行搜索操作，根据关键字查询相关数据
        // ...
    }
}

public function index() {
    if ($this->request->is('get')) {
        $keyword = $this->request->query('keyword');
        // 执行搜索操作，根据关键字查询相关数据
        $results = $this->ModelName->find('all', array('conditions' => array('field LIKE' => "%$keyword%")));
        $this->set('results', $results);
    }
}