CakePHP: How can I use a "HAVING" operation when building queries with find method?

You have to put it with the group conditions. like this

$this->find('all', array(
    'conditions' => array(
        'Post.length >=' => 100
    ),
    'fields' => array(
        'Author.id', 'COUNT(*) as Total'
    ),
    'group' => array(
        'Total HAVING Total > 10'
    )
));

Hope it helps you