A bunch of functions to allow a custom Editor-like role for managing a specific Custom Post Type in Wordpress.

CPT-Admin.php

<?php 

	// Register Region CPT

	add_action( 'init', 'register_cpt_region' );

	function register_cpt_region() {

		$labels = array( 
			'name' => _x( 'Regions', 'region' ),
			'singular_name' => _x( 'Region', 'region' ),
			'add_new' => _x( 'Add New', 'region' ),
			'add_new_item' => _x( 'Add New Region', 'region' ),
			'edit_item' => _x( 'Edit Region', 'region' ),
			'new_item' => _x( 'New Region', 'region' ),
			'view_item' => _x( 'View Region', 'region' ),
			'search_items' => _x( 'Search Regions', 'region' ),
			'not_found' => _x( 'No regions found', 'region' ),
			'not_found_in_trash' => _x( 'No regions found in Trash', 'region' ),
			'parent_item_colon' => _x( 'Parent Region:', 'region' ),
			'menu_name' => _x( 'Regions', 'region' ),
		);

		$args = array( 
			'labels' => $labels,
			'hierarchical' => true,
			
			'supports' => array( 'title', 'editor', 'author', 'thumbnail' ),
			
			'public' => true,
			'show_ui' => true,
			'show_in_menu' => true,
			'menu_position' => 5,
			
			'show_in_nav_menus' => true,
			'publicly_queryable' => true,
			'exclude_from_search' => false,
			'has_archive' => true,
			'query_var' => true,
			'can_export' => true,
			'rewrite' => true,
			'capability_type' => 'region',
			'map_meta_cap' => true // as per http://codex.wordpress.org/Function_Reference/register_post_type
		);

		register_post_type( 'region', $args );
	}

	/************************
	 *
	 * Regional Admin user role stuff
	 *
	 ***********************/

	// Create the new user role for Regional Admin
	function gpi_create_region_admin_role() {
		
		$region_admin_caps = array(

			'read' => true,
			'read_region' => true,
			'edit_regions' => true,
			'edit_published_regions' => true,
			'read_post' => true,
			'delete_posts' => true,
			'delete_published_posts' => true,
			'edit_posts' => true,
			'edit_published_posts' => true,
			'publish_posts' => true,
			'moderate_comments' => true,
			'upload_files' => true,
			'level_1' => true //http://stackoverflow.com/questions/6330008/wordpress-custom-users-not-appearing-in-author-box
		);

		// Create a New Role for Regional Admin
		add_role( 'region_admin', 'Regional Admin', $region_admin_caps );
	}
	add_action( 'admin_init', 'gpi_create_region_admin_role' );

	// Give Administrators and Editors All Region Capabilities
	function add_region_caps_to_admin() {
	  $caps = array(
		'read',
		'read_region',
		'read_private_regions',
		'edit_regions',
		'edit_private_regions',
		'edit_published_regions',
		'edit_others_regions',
		'publish_regions',
		'delete_regions',
		'delete_private_regions',
		'delete_published_regions',
		'delete_others_regions',
	  );
	  $roles = array(
		get_role( 'administrator' ),
		get_role( 'editor' )
	  );
	  foreach ($roles as $role) {
		foreach ($caps as $cap) {
		  $role->add_cap( $cap );
		}
	  }
	}
	add_action( 'admin_init', 'add_region_caps_to_admin' );

	// Add ability to edit/delete image attachments (without needing ability to edit Posts)
	function gpi_fix_media_permissions() {
		global $wp_post_types;
		$wp_post_types['attachment']->cap->edit_post = 'upload_files';
		$wp_post_types['attachment']->cap->delete_posts = 'upload_files';
		$wp_post_types['attachment']->cap->edit_posts = 'upload_files';
	}
	add_action( 'admin_init',  'gpi_fix_media_permissions' );

	// Small utility function for returning the Region page object for a user
	function get_region_id_by_user( $user_id ) {

		$user_regions = array();

		/* Custom Query for Finding Posts by this User */
		$users_posts_args = array (
			'author'            => $user_id,
			'post_type'         => 'region',
			'posts_per_page'    => '-1'
		);
		
		$users_posts_query = new WP_Query( $users_posts_args );
		
		while ($users_posts_query->have_posts()) : $users_posts_query->the_post();

			global $post;
			
			$user_regions[] = array(
				'user_region_ID'     => get_the_ID(),
				'user_region_title'  => get_the_title(),
				'user_region_slug'   => $post->post_name
			);

		endwhile; 
		wp_reset_query();
		wp_reset_postdata();

		return $user_regions;

	}

	// Small utility function for getting current User's role
	function gpi_get_user_roles() {
		global $current_user;

		$user_roles = $current_user->roles;

		return $user_roles;
	}

	// Small Utility function to see if current user is a specific role
	function gpi_is_current_user($user_role) {

		$current_user_role_array = gpi_get_user_roles();

		if ( in_array($user_role, $current_user_role_array) ) {
			return true;
		} 
		else return false;
	}

	// Small Utility function to grab the Region(s) for the current author
	function gpi_get_associated_region( $current_author ) {

		// Get the Region associated with the Author
		$associate_region_obj = get_region_id_by_user($current_author);

		// Create an empty array to store the values as strings
		$associated_regions = array();

		foreach ($associate_region_obj as $region) {
			// Convert the region ID to string and add to the new array
			$associated_regions[] = strval($region['user_region_ID']);
		}

		return $associated_regions;
	}

	// Customize the Admin bar for Regional Admin
	function gpi_admin_bar_render_user() {

		global $wp_admin_bar;
		$current_user = wp_get_current_user();

		// A way of checking if current user is a Region Admin (and they aren't Admin)
		if ( gpi_is_current_user('region_admin') ) {
		
			$wp_admin_bar->remove_menu('new-content');
			$wp_admin_bar->remove_menu('comments');

		}

	}
	add_action( 'wp_before_admin_bar_render', 'gpi_admin_bar_render_user' );

	// Remove some items from Admin menu (left column) for Regional Admin only
	function gpi_admin_menu_render() {

	    // A way of checking if current user is a Youth Group (and they aren't Admin)
	    if ( gpi_is_current_user('region_admin') ) {

	        // Submenu for region
	        remove_submenu_page( 'edit.php?post_type=region', 'post-new.php?post_type=region' );

	        // Main menu for any CPTs that aren't Posts (because the capability 
	        // is set as 'post' for many of these CPTs, they show up for the 
	        // Regional Admin role because of thier ability to edit_post)
			
	        // First, get all post types with the post capability
	        $post_types = get_post_types( array('capability_type' => 'post') );

	        // Then, loop through the list and hide all menus (except Posts themselves)
	        foreach ($post_types as $post_type) {
	            remove_menu_page( 'edit.php?post_type=' . $post_type );
	        }

	        //In addition, hide the Contact menu option
	        remove_menu_page( 'wpcf7' );
	    }

	}
	add_action( 'admin_init', 'gpi_admin_menu_render' );

	// Hide some menu items from Regional Admin users, not from admins – with CSS
	function gpi_hide_region_admin_menu_items() {

		if ( gpi_is_current_user('region_admin') ) {
			echo '<style type="text/css">#adminmenu li.menu-icon-dashboard,#adminmenu li.menu-icon-media{display:none;}</style>';
		}

	}
	add_action('admin_head', 'gpi_hide_region_admin_menu_items');

	// Change the default redirect location after login
	function gpi_custom_login_redirect($redirect_to, $request, $user){
		  //is there a user to check?
		 if( !empty($user->roles) && is_array($user->roles)){
			   //check for admins
			   if(in_array("administrator", $user->roles)){
					return home_url("/wp-admin/");
				} elseif(in_array("region_admin", $user->roles)) {
					return home_url("/wp-admin/edit.php?post_type=region");
				} else {
					return home_url();
				}
		 }
	}
	add_filter("login_redirect", "gpi_custom_login_redirect", 10, 3);

	// And hide that tiny "Add New" button from next to the Post Type name on edit.php of admin (posts table)
	function gpi_remove_add_new_link() {
		// Only on Region post type, and not for admins
		if( 'region' == get_post_type() && ! current_user_can('create_users') )
			echo '<style type="text/css">a.add-new-h2{display:none;}</style>';

			// Also hide the Post Duplicator
			echo '<style type="text/css">.wp-list-table .duplicate_post{display:none;}</style>';
		}
	add_action('admin_head', 'gpi_remove_add_new_link');

	// Auto-assigns the current author's associate region id to any post they publish
	function gpi_auto_assign_region_to_post( $post_id ) {

		global $current_user;

		// Only for Region Admin user roles and only for Posts
		if ( gpi_is_current_user('region_admin') && 'post' == get_post_type($post_id) ) {

			// Grab any Regions that are associate with this post author
			$regions_by_author = gpi_get_associated_region( $current_user->ID );
		
			// Store the array as a metavalue on publish, WP automatically serializes it
			if(!wp_is_post_revision($post_id)) {
				// Use the ACF plugin, if it exists
				if ( is_plugin_active( 'advanced-custom-fields/acf.php' ) ) {
					// field_52eafab4be98f is the ID for 'related_region'
					update_field('field_52eafab4be98f', $regions_by_author, $post_id);
				} // Otherwise, just store as post meta, which still works but may duplicate DB entries 
				else {
					add_post_meta($post_id, 'related_region', $regions_by_author, true);
				}
			}

		} 
	}
	add_action( 'publish_post', 'gpi_auto_assign_region_to_post' );

?>