filter custom post type by meta key in dashboard

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How to filter post listing (in WP dashboard posts listing) using a custom field (search functionality)?

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I’ve a custom post type in the dashboard i’ve managed to have a small search box with a fixed search function to search a specific meta key. The things is that the search form appears on all the /edit.php pages while i need it only in the specific custom post type edit.php page.

I tried with 

if (isset($_GET['post_type']) && $_GET['post_type'] == 'product')

but it doesn’t seem to work.

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  1. I’m assuming you’ve used the method in the question linked to and are using the restrict_manage_posts filter.

     add_action( 'restrict_manage_posts', 'my_search_box' );
 function my_search_box() {
     // only add search box on desired custom post_type listings
     global $typenow;
     if ($typenow == 'product') {
       //On custom post type 'product' admin page.
       //Add code for search box here
     }
  }