Add custom capabilities to custom post type

Add custom capabilities to custom post type.php

<?php

function charity_post_type_register() {

	$labels = array(
		'name'               => __( 'Charities', 'text-domain' ),
		'singular_name'      => __( 'Charity', 'text-domain' ),
		'add_new'            => _x( 'Add New Charity', 'text-domain', 'text-domain' ),
		'add_new_item'       => __( 'Add New Charity', 'text-domain' ),
		'edit_item'          => __( 'Edit Charity', 'text-domain' ),
		'new_item'           => __( 'New Charity', 'text-domain' ),
		'view_item'          => __( 'View Charity', 'text-domain' ),
		'search_items'       => __( 'Search Charities', 'text-domain' ),
		'not_found'          => __( 'No Charities found', 'text-domain' ),
		'not_found_in_trash' => __( 'No Charities found in Trash', 'text-domain' ),
		'parent_item_colon'  => __( 'Parent Charity:', 'text-domain' ),
		'menu_name'          => __( 'Charities', 'text-domain' ),
	);

	$args = array(
		'labels'              => $labels,
		'hierarchical'        => false,
		'description'         => 'description',
		'taxonomies'          => array(),
		'public'              => true,
		'show_ui'             => true,
		'show_in_menu'        => true,
		'show_in_admin_bar'   => false,
		'menu_position'       => null,
		'menu_icon'           => null,
		'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' => 'charity',
		'capabilities' => array(
			'create_posts' => 'do_not_allow',
			'publish_posts' => 'publish_charities',
			'edit_posts' => 'edit_charities',
			'edit_others_posts' => 'edit_others_charities',
			'delete_posts' => 'delete_charities',
			'delete_others_posts' => 'delete_others_charities',
			'read_private_posts' => 'read_private_charities',
			'edit_post' => 'edit_charity',
			'delete_post' => 'delete_charity',
			'read_post' => 'read_charity',	
		),
		//'map_meta_cap' => true,
		'supports'            => array(
			'title',
			'editor',
			'thumbnail',
		),
	);

	register_post_type( 'slug', $args );
}

add_action( 'init', 'charity_post_type_register' );

add_filter( 'map_meta_cap', 'my_map_meta_cap', 10, 4 );

function my_map_meta_cap( $caps, $cap, $user_id, $args ) {

	/* If editing, deleting, or reading a movie, get the post and post type object. */
	if ( 'edit_charity' == $cap || 'delete_charity' == $cap || 'read_charity' == $cap ) {
		$post = get_post( $args[0] );
		$post_type = get_post_type_object( $post->post_type );

		/* Set an empty array for the caps. */
		$caps = array();
	}

	/* If editing a movie, assign the required capability. */
	if ( 'edit_charity' == $cap ) {
		if ( $user_id == $post->post_author )
			$caps[] = $post_type->cap->edit_posts;
		else
			$caps[] = $post_type->cap->edit_others_posts;
	}

	/* If deleting a movie, assign the required capability. */
	elseif ( 'delete_charity' == $cap ) {
		if ( $user_id == $post->post_author )
			$caps[] = $post_type->cap->delete_posts;
		else
			$caps[] = $post_type->cap->delete_others_posts;
	}

	/* If reading a private movie, assign the required capability. */
	elseif ( 'read_charity' == $cap ) {

		if ( 'private' != $post->post_status )
			$caps[] = 'read';
		elseif ( $user_id == $post->post_author )
			$caps[] = 'read';
		else
			$caps[] = $post_type->cap->read_private_posts;
	}

	/* Return the capabilities required by the user. */
	return $caps;
}