before correctHABTMdata():

Array
(
    [Post] => Array
        (
            [Post] => 19
        )

    [User] => Array
        (
            [User] => 
        )

    [Comment] => Array
        (
            [body] => test
            [user_id] => 1
        )

)



after correctHABTMdata():

Array
(
    [Comment] => Array
        (
            [body] => test
            [user_id] => 1
        )

    [Post] => Array
        (
            [Post] => Array
                (
                    [0] => 19
                )

        )

)