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I am building an LMS type system in WordPress, controlled by Custom Post types. The post type is called Lessons (with a slug of courses) and it has one custom taxonomy (category) called courses. The domain url structure shows right now as domain.com/courses/lesson-name, I want it to become domain.com/courses/[course-name{category}]/lesson-name, or essentially /[cpt]/%category%/%postname%/ here is the plugin I wrote that is controlling the CPTs now.

function rflms_post_type() {
    $labels = array(
        'name'                => _x( 'Lessons', 'Post Type General Name', 'text_domain' ),
        'singular_name'       => _x( 'Lesson', 'Post Type Singular Name', 'text_domain' ),
        'menu_name'           => __( 'Lessons', 'text_domain' ),
        'parent_item_colon'   => __( 'Parent Product:', 'text_domain' ),
        'all_items'           => __( 'All Lessons', 'text_domain' ),
        'view_item'           => __( 'View Lesson', 'text_domain' ),
        'add_new_item'        => __( 'Add New Lesson', 'text_domain' ),
        'add_new'             => __( 'New Lesson', 'text_domain' ),
        'edit_item'           => __( 'Edit Lesson', 'text_domain' ),
        'update_item'         => __( 'Update Lesson', 'text_domain' ),
        'search_items'        => __( 'Search Lessions', 'text_domain' ),
        'not_found'           => __( 'No Lessons Found', 'text_domain' ),
        'not_found_in_trash'  => __( 'No Lessons Found in Trash', 'text_domain' ),
    );

    $args = array(
        'label'               => __( 'Lessons', 'text_domain' ),
        'description'         => __( 'Referable Lessons', 'text_domain' ),
        'labels'              => $labels,
        'hierarchical'        => false,
        'public'              => true,
        'show_ui'             => true,
        'show_in_menu'        => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'supports'        => array('premise-member-access', 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments'),
        'menu_position'       => 5,
        'menu_icon'           => null,
        'can_export'          => true,
        'has_archive'         => true,
        'exclude_from_search' => false,
        'publicly_queryable'  => true,
        'capability_type'     => 'post',
        'rewrite'                    => array('slug' => 'courses'),
    );

    register_post_type( 'lessons', $args );


// Hook into the 'init' action

}
add_action( 'init', 'rflms_post_type', 0 );

// Register Custom Taxonomy
function custom_taxonomy()  {
    $labels = array(
        'name'                       => _x( 'Courses', 'Taxonomy General Name', 'text_domain' ),
        'singular_name'              => _x( 'Course', 'Taxonomy Singular Name', 'text_domain' ),
        'menu_name'                  => __( 'Courses', 'text_domain' ),
        'all_items'                  => __( 'All Courses', 'text_domain' ),
        'parent_item'                => __( 'Parent Course', 'text_domain' ),
        'parent_item_colon'          => __( 'Parent Course:', 'text_domain' ),
        'new_item_name'              => __( 'New Course Name', 'text_domain' ),
        'add_new_item'               => __( 'Add New Course', 'text_domain' ),
        'edit_item'                  => __( 'Edit Course', 'text_domain' ),
        'update_item'                => __( 'Update Course', 'text_domain' ),
        'separate_items_with_commas' => __( 'Separate Courses with commas', 'text_domain' ),
        'search_items'               => __( 'Search Courses', 'text_domain' ),
        'add_or_remove_items'        => __( 'Add or Remove Courses', 'text_domain' ),
        'choose_from_most_used'      => __( 'Choose from Most Used courses', 'text_domain' ),
    );

    $args = array(
        'labels'                     => $labels,
        'hierarchical'               => true,
        'public'                     => true,
        'show_ui'                    => true,
        'show_admin_column'          => true,
        'show_in_nav_menus'          => true,
        'show_tagcloud'              => false,
        'rewrite'                    => array('slug' => 'courses'),
    );

    register_taxonomy( 'course', 'lessons', $args );
}

// Hook into the 'init' action
add_action( 'init', 'custom_taxonomy', 0 );
share|improve this question

1 Answer 1

up vote 4 down vote accepted

Change your rewrite to add the course query var:

'rewrite' => array('slug' => 'courses/%course%')

Then filter post_type_link to insert the selected course into the permalink:

function wpa_course_post_link( $post_link, $id = 0 ){
    $post = get_post($id);  
    if ( is_object( $post ) ){
        $terms = wp_get_object_terms( $post->ID, 'course' );
        if( $terms ){
            return str_replace( '%course%' , $terms[0]->slug , $post_link );
        }
    }
    return $post_link;  
}
add_filter( 'post_type_link', 'wpa_course_post_link', 1, 3 );

There are also plugins like Custom Post Type Permalinks that can do this for you.

share|improve this answer
    
Thank you, I appreciate your swift answer. This makes complete sense. I'm curious though, where do I insert the filter post_type_link at? can i just go at the bottom of the entire document? –  Zach Russell Apr 6 '13 at 16:26
    
I added it to the bottom and it 404's the page. –  Zach Russell Apr 6 '13 at 16:31
1  
you have to flush rewrites, visit the permalinks settings page. –  Milo Apr 6 '13 at 17:09
    
also note you'll likely have a clash with a taxonomy and a post type both sharing the same slug. –  Milo Apr 6 '13 at 17:13
    
Where i'm at now is it's making the permalinks right, but it's not executing correctly (it's soft 404ing). Any recommendations on what I can do to get this working right? I'm away of the permalink flush rewrites. Just click 'save' and it updates the file (it's nginx so it's controlled in the nginx.conf file) –  Zach Russell Apr 6 '13 at 17:29

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