Retrieving Posts with comments

Hello

i have a simple app that's very similar to the cookbook "Blog"
tutorial

i want to retrieve all Posts having at least one comment.

right now i'm doing this way:

$posts = $this->Post->find("all", array("contain" =>
array("Comment"));
foreach ($posts as $index => $post) {
if (empty($post["Comment"])) unset $posts[$index];
}

is there any way to achieve this by using a single ->find() call?

notes: i'm using Containable.

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