How to add custom columns to Custom Post Type admin screen

I have another dumb question, but I can’t get one thing 🙂

I’ve found this very good article on creating custom post types:

http://thinkvitamin.com/code/create-your-first-wordpress-custom-post-type/

I’m not sure how Step 4 works.

This guys writes:

add_action("manage_posts_custom_column",  "portfolio_custom_columns");
add_filter("manage_edit-portfolio_columns", "portfolio_edit_columns");

function portfolio_edit_columns($columns){
  $columns = array(
    "cb" => "<input type=\"checkbox\" />",
    "title" => "Portfolio Title",
    "description" => "Description",
    "year" => "Year Completed",
    "skills" => "Skills",
  );

  return $columns;
}
function portfolio_custom_columns($column){
  global $post;

  switch ($column) {
    case "description":
      the_excerpt();
      break;
    case "year":
      $custom = get_post_custom();
      echo $custom["year_completed"][0];
      break;
    case "skills":
      echo get_the_term_list($post->ID, 'Skills', '', ', ','');
      break;
  }
}

I have two different post types (‘books’ and ‘movies’).

And I can’t get how to link this code with right one!

I’m sure I’m missing something (most likely in the code), but I didn’t see him including “portfolio_edit_columns” anywhere in the code.

I have found this in WP Codex: http://codex.wordpress.org/Plugin_API/Action_Reference/manage_posts_custom_column and it seems like

manage_edit-${post_type}_columns

does the magic, but I’ve tried both manage_edit-books_columns and manage_edit-movies_columns and nothing! 🙂

So how to create two separate column layouts for different post types?

The code from ThinkVitamin is right. I think the problem came from else where in your code.

Actually, the hook manage_edit-${post_type}_columns takes an argument $columns which is an array of all registered columns. To add a new column, just add a new element to this array, like this:

add_filter('manage_edit-film_columns', 'my_columns');
function my_columns($columns) {
    $columns['views'] = 'Views';
    return $columns;
}