User restricted only show posts assigned to current user

Question

I have to make a site where i have to assign posts to users.

Want i already did:

1: made new user roles with only 'read' enabled

But i can't seem to figure out how to assign a certain post to a specific user/user role. So that when there logged in they will only see the post that is assigned to them, instead of seeing all the post and when they click it they get a message like: "Sorry, you have to be user*** to see this post."

Does anyone know how to do this?

Answer 1

You search certainly something like Members plugin.

It allow you create a custom Role and You can make your site and its feed completely private if you want or just one or 2 posts. Its like you want.

Or Manually, you can add new roles:

function add_role() {
    add_role( 'private_user', "private user",array(
        'is_able_to_read_private_page'=> true,
        'read'=> true
    ) );
}
add_action('init','add_role');

And Create a custom page and using something like: (ITS AN EXAMPLE)

 <?php /*Template Name: Private page Template*/
 get_header();
 if(current_user_can( "is_able_to_read_private_page")):
    if( have_posts() ):
       while( have_posts() ):
           the_post();
        endwhile;
    endif;
 else:
     echo "Access Denied";
 endif;
 get_footer();?>

Answer 2

I did something similar once.

I needed to attach one or more CPT to specific customers.

I made a searchable select box containing all users in the edit screen of the CPT only available to admins.

The admin would create the post, save it, and then change the author of the post to the desired customer username.

The reason I chose to go this way is because a post cannot assigned to a user, unless that user is it's author. You could also try to add a metabox to your post type which will contain the authorized users for your post to filter by meta key. But by using this method you can easily filter using the main query. It's just a matter of changing the ownership of your post. I guess it all depends on the nature of your project.

Then I had a script which filtered the posts something like this.

Note that this code is a general idea. Writing from what I remember.

add_action( 'pre_get_posts', 'wpse_show_user_posts');
function wpse_show_user_posts( $query ){

  // Don't filter if user is an administrator
  if ( current_user_can( 'list_users' ) )
    return;

  // Get all posts which our current user is an author for
  if( is_user_logged_in() && $query->is_main_query() ){

    $current_user = wp_get_current_user();

    $query->set( 'author', $current_user->ID );

  }

  // Hide all posts otherwise
  if( $query->is_main_query() ) {

    $query->set( 'category__not_in', '1' ); // Use the id of the retricted category

  }

  return $query;

}

Of course you might want to use custom roles with appropriate capabilities so you have better control on what your users can do. Know that any users can be the post authors, but the default author metabox select field on a post edit screen will only return users with at least contributor roles (which also have delete_posts capability). So that is why I created a custom select box returning the users from my custom role.

You might also only return that restricted content only to logged in users.

add_filter( 'the_content', 'logged_in_only' );
function logged_in_only( $content ){
  $categories = get_the_category();
  $cat_not_in = 'some-cat';
  $include_post =  true;

  foreach( $categories as $category ){
    if( $category->slug == $cat_not_in )
      $include_post = false;
  }

  if( is_user_logged_in() || $include_post ) {
    return $content;
  }

  return 'You need to log in <a href="' . home_url( 'wp-login.php') . '">Here</a>';
}

You would need to create a restricted category and assign the posts you wish to control to that category in order to properly filter those posts to users not logged in.