Loading posts associated only to the logged in user on recent posts page

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You should be able to get the current logged in user ID and then use pre_get_posts to alter the main query on the home/blog page to only show posts from that specific user. As I understand, you are talking specifically about authors.

You might want to also check the user’s capabilities as well as simple subscribers won’t see any posts on the blog/homepage as they can’t author posts.

A very simple pre_get_posts action will look something like this: (NOTE: The following is untested)

add_action( 'pre_get_posts', function ( $q )
{    
    if ( is_user_logged_in() ) { // First check if we have a logged in user before doing anything
        if (    $q->is_home() // Only targets the main page, home page
             && $q->is_main_query() // Only targets the main query
        ) {
            // Get the current logged in user
            $current_logged_in_user = wp_get_current_user();

            // Set the logged in user ID as value to the author parameter
            $q->set( 'author', $current_logged_in_user->ID );
        }
    }    
});

EDIT

From comments, it seems that each user has a category with the same name and this specific category is then attached to a post

To accommodate this, you will need to do the following

  • As above, get the current logged in user

  • You will then need to use the info from the current user which will match up to the category. For instance and as an example, if 'display_name' == 'category name', then, if the user display name is Jane Doe, then the category name assigned to the name will also be called Jane Doe

  • In the above example, we need to get the category by name so that we can get the category ID. We will be using get_term_by() which can be used with build in taxonomies like category or custom taxonomies

  • We can then go ahead and do the same as in the original answer

You can do something like this; (I have commented the code so you can understand and follow it better)

add_action( 'pre_get_posts', function ( $q )
{    
    if ( is_user_logged_in() ) { // First check if we have a logged in user before doing anything
        if (    $q->is_home() // Only targets the main page, home page
             && $q->is_main_query() // Only targets the main query
        ) {
            // Get the current logged in user
            $current_logged_in_user = wp_get_current_user();
            /**
             * We will now get the term/category object from the user display_name
             * You will need to make sure if this corresponds with your term/category
             * If not, use the correct info to match
             */
            $term = get_term_by( 
                'name', // We will get our term by name as term name == user display_name. Change as needed
                $current_logged_in_user->display_name, // Our value to look for will be user display_name
                'category' // The taxonomy the term belongs to. category is the build in taxonomy
            );
            if ( $term ) { // Only filter the main query if we actually have a term with the desired name
                $q->set( 'cat', $term->term_id ); // Filter the posts to only show posts from the desired category
            }
        }
    }    
});

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