Permit users with author role to edit a custom post type

Question

I have this already coded project which has a custom post type with a certain behavior: it is only a single post and admins/editors/authors can only edit its content. it's content is a custom data table. administrators and editors can edit just fine. i want Authors to be able to edit this single post as well but i can't seem to be able to find out how. the code is this:

add_action('init', 'register_post_types');
    function register_post_types(){

    register_post_type('post_type_uo', array(
            'labels' => array(
            'name'               => 'uo Articles', 
            'singular_name'      => 'uo', 
            'add_new'            => 'Add uo', 
            'edit_item'          => 'Edit Post', 
            'view_item'          => 'View Post', 
            'search_items'       => 'Find Post', 
            'not_found'          => 'Not Found', 
            'not_found_in_trash' => 'Not Found', 
            'parent_item_colon'  => '', 
            'menu_name'          => 'uo', 
        ),
    'public' => true, 
    'menu_position' => 4, 
    'exclude_from_search' => true,  
    'has_archive' => false,  
    'rewrite' => array('slug' => 'daily-uo'), 
    'taxonomies'    => array( 'dailies' , 'category'),
    'menu_icon'     => 'dashicons-chart-line', // custom icon
    'capabilities' => array('create_posts'  => false,),
    'map_meta_cap' => true,
    'supports'      => array('title')
    ));
    }

i tried to add a capabilities array and then installed "Members" plugin.

'capabilities' => array(
        'create_posts' => 'do_not_allow', // false < WP 4.5, credit @Ewout
        'read_posts' => 'read_uos',
        'edit_post' => 'edit_uo',
        'edit_posts' => 'edit_uos',
        'published_posts' => 'publish_uo',
        'edit_published_posts' => 'edit_uo_p',
        'edit_others_posts ' => 'edit_uo_others'
      ),

i can see the capabilities in plugin's roles page and select them but still no edit access for users with the Athor role.

Finally i made a new role -uo_Author- via the plugin giving the correct(??) permissions but still no luck

any ideas?

Answer 1

Register "dailies" as a taxonomy.

The Codex for "register post type" says "even if you register a taxonomy while creating the post type, you must still explicitly register and define the taxonomy using register_taxonomy()."

PS: I would have added this as a comment to your question had I been able.

UPDATE: 22 August 2018
OK. Let's start this discussion again. You do need to add the taxonomy but that isn't the reason that your authors can't see/edit your posts.

In your function to register_post_type, there were some syntax errors in your "capabilities" that were enough to stop an author seeing the uo post. So, edit 'capabilities' to match the following:

'capabilities' => array( 'create_posts' => 'do_not_allow', // false < WP 4.5, credit @Ewout 'read_posts' => 'read_uos', 'edit_post' => 'edit_uo', 'edit_posts' => 'edit_uos', 'publish_posts' => 'publish_uos', 'edit_published_posts' => 'edit_published_uos', 'edit_others_posts' => 'edit_others_uos' ),

Using the Members plugin, assign all the capabilities for "uo Articles", though maybe you won't want to grant the various "delete" and "private" capabilities.

You don't need to add the additional author role. In fact, it might be more confusing that it is worth.