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I've created a few CPTs, and wish to have one of the custom post types to query from other post types.

So what I did is I used the codes below to alter the query:

add_filter('pre_get_posts', 'code_to_alter_query', 10);

function code_to_alter_query($query) {
  // If not backend, bail out
  if( !is_admin() ) return $query;

  $cpts = array('custom_job', 'custom_us_job');
  $query->set( 'post_type', $cpts );

  return $query;
}

Now it will show jobs from both custom_job and custom_us_job. But this will apply to both of the CPTs, what if I want only custom_job to have both jobs while custom_us_job to have the default query?

I tried using

global $pagenow;

But this can only get the edit.php which will be the same to all the CPTs, how can I determine which (admin) page am I in now?

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The function you are looking for is get_current_screen(). To check if you are on a specific custom post type page, do as follows:

$screen = get_current_screen();
if ( $screen->post_type == 'custom_job' ) {
    // We are on custom_job post type, good to go
}

Now, if you visit edit.php?post_type=custom_job, this conditional will return true, which you can set your query inside.

There is also another approach for this. By using is_post_type_archive('custom_job'), you can target the edit.php?post_type=custom_job. Make sure you use this in conjunction with is_admin() to make sure you don't target the front-end.

2
  • But when I called get_current_screen(), it gets nothing, it returns an empty value. – Park Lai Jul 24 '17 at 8:05
  • I've updated the answer. @ParkLai – Jack Johansson Jul 24 '17 at 8:29

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