File signed in user as author of submitted form which files to custom post type

Hello,

My form files to a custom post type in a Pending status. Only signed in users can submit entries with the form.

I'm having a problem getting the user that's signed in to be associated to the Pending post that's created. Right now it's always defaulting to me.

I've tried using a hidden field with the default value set to User Login. In the email that's generated I can see the correct user's login name defined, but the post is not associated to the user.

I've also tried dynamically populating the field with:

add_filter('gform_field_value_submitted_by_user', 'populate_submitted_by_user');
function populate_submitted_by_user($value){
 global $current_user;
 get_currentuserinfo();
 return $current_user -> user_login;
}

Again, the email that's generated displays the correct user login name but the post is not associated to the user.

Users are set as contributors when registering on the site.

Thanks Chris! I forgot that was an option when I first defined the form to file to a custom post type!