function add()
{
    if (!empty($this->data))
    {
        // Here we save all post data.
        // If Comment is part of all post data, we save Comment.

        $this->Post->save($this->data);

        $post_id = $this->Post->getLastInsertId();

        $this->data['Comment']['post_id'] = $post_id;

        // Observe that Comment is part of Post.
        // Observe that Comment was saved and Comment is saved again.

        $this->Post->Comment->save($this->data);

    }
}

// Why save the Comment data twice?
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