Replace standard comment form with a gravity form

I was able to add form submissions and turn them into comments by using the following code. In your theme you would have to replace the comment form by adding your gravity form in single.php. There are many posts on here on how to add a form to a template page.

add_action("gform_after_submission_1", "add_comment"); //change form ID to match your form
function add_comment($entry, $form){

	$time = current_time('mysql');

	$data = array(
		'comment_post_ID' => $entry["post_id"] ,
		'comment_author' => $entry[17], //change to match your author field ID
		'comment_author_email' => $entry[18], //change to match your email field ID
		'comment_content' => $entry[32], //change to match your comment field ID
		'comment_type' => '',
		'comment_parent' => 0,
		'user_id' => $entry["created_by"],
		'comment_author_IP' => $entry["ip"] ,
		'comment_agent' => '',
		'comment_date' => $time,
		'comment_approved' => 1,
	);
		wp_insert_comment($data);
}

I got this working using the code above with one exception. It doesn't seem to be populating the comment_post_ID field. The comment gets created without being attached to a post and then can't be managed (approve/spam/delete) from the dashboard.

I ended up hard coding the post ID, since I know the page the form is coming from, not sure why it wasn't working.

I would also like to get the post_id working. Does anyone have any ideas or another method to get this working?