How to enable parent-child relationships and post attribute admin widget for posts

Question

I want to be able to select a parent post when i create a new post. I assume it should be easy just to make the 'page attributes' admin widget to work similarly for posts too. The use case is for this site: thedevs.org where i want to enable people to post projects then later on make new posts that are children to a project post and would be listed under the parent post. I am slightly new to wordpress but i play around with php quite easily. A working plugin or code snippet would help.

Answer 1

The parameter that controls post-type hierarchy is called 'hierarchical', and is set when the post type is registered via register_post_type(). WordPress core registers the 'post' post-type with 'hierarchical' => false.

To override this setting, refer to this question.

Answer 2

Adding this code on my ..mytheme/functions.php file sort of worked for me:

            /* Register Custom Post Type for Projects*/
            add_action('init', 'project_post_type_init');
            function project_post_type_init() {
              $labels = array(
                'name' => _x('My Projects', 'post type general name'),
                'singular_name' => _x('Project', 'post type singular name'),
                'add_new' => _x('Add New', 'Project'),
                'add_new_item' => __('Add New Project'),
                'edit_item' => __('Edit Project'),
                'new_item' => __('New Project'),
                'view_item' => __('View Project'),
                'search_items' => __('Search Projects'),
                'not_found' =>  __('No Projects found'),
                'not_found_in_trash' => __('No Projects found in Trash'),
                'parent_item_colon' => __('Post'),
                'parent' => __('Post'),
              );
              $args = array(
                'labels' => $labels,
                'public' => true,
                'publicly_queryable' => true,
                'show_ui' => true, //false - to hide from the admin area menu
                'rewrite' => true,
                'query_var' => true,
                'capability_type' => 'post',
                'hierarchical' => true, //allow parent pages
                'show_in_nav_menus' => false,
                'menu_position' => 1000,
                'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments', 'page-attributes')
              );
              register_post_type('project',$args);
            }

Answer 3

Just go through below Documentation and add the function in your functions.php https://codex.wordpress.org/Function_Reference/add_post_type_support