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I am creating a plugin where i have created a custom post type smart-event and I want to serve the single posts under this category via a single page.That's why I have created a single post page named : single-event.php directly into plugin folder -like- event > single-event.php

And I am using this function to load the single page

function myevent($template) {
if ('event' == get_post_type(get_queried_object_id()) && !$template) {
    $template = dirname(__FILE__) . '/single-event.php';
}
return $template;
}
add_action( 'single_template', 'myevent'));

But the single post is being shown in theme single.php page not in the page i have created.

Below is my CPT register code and i have flush the rewrite mode in permalink settings.

function eventCPT(){
    $labels = array(
        'name'               => esc_html__( 'Events',                   'event' ),
        'singular_name'      => esc_html__( 'Event',                    'event' ),
        'menu_name'          => esc_html__( 'Event',                'event' ),
        'name_admin_bar'     => esc_html__( 'Event',                'event' ),
        'add_new'            => esc_html__( 'Add New Event',            'event' ),
        'add_new_item'       => esc_html__( 'Add New Event',            'event' ),
        'new_item'           => esc_html__( 'New Event',                'event' ),
        'edit_item'          => esc_html__( 'Edit Event',               'event' ),
        'view_item'          => esc_html__( 'View Event',               'event' ),
        'all_items'          => esc_html__( 'All Events',               'event' ),
        'search_items'       => esc_html__( 'Search Events',            'event' ),
        'parent_item_colon'  => esc_html__( 'Parent Events:',           'event' ),
        'not_found'          => esc_html__( 'No events found.',         'event' ),
        'not_found_in_trash' => esc_html__( 'No events found in Trash.','event' )
    );

    $args = array(
        'labels'             => $labels,
        'description'        => __( 'Description.', 'event' ),
        'public'             => true,
        'publicly_queryable' => true,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => array( 'slug' => 'event' ),
        'capability_type'    => 'post',
        'has_archive'        => false,
        'hierarchical'       => false,
        'menu_position'      => null,
        'menu_icon'          => 'dashicons-calendar-alt',
        'supports'           => array( 'title', 'author', 'thumbnail', 'excerpt', 'comments' )
    );

    register_post_type( 'event', $args );
}

add_action( 'init', 'eventCPT'));
  • 2
    I'll guess that $template is not empty and it never passes your if check. – Milo Jun 12 '18 at 16:00
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OK, let's try to find this filter in WP code...

In wp-includes/template.php you can find this:

function get_single_template() {
    $object = get_queried_object();

    $templates = array();

    if ( ! empty( $object->post_type ) ) {
        $template = get_page_template_slug( $object );
        if ( $template && 0 === validate_file( $template ) ) {
            $templates[] = $template;
        }

        $name_decoded = urldecode( $object->post_name );
        if ( $name_decoded !== $object->post_name ) {
            $templates[] = "single-{$object->post_type}-{$name_decoded}.php";
        }

        $templates[] = "single-{$object->post_type}-{$object->post_name}.php";
        $templates[] = "single-{$object->post_type}.php";
    }

    $templates[] = "single.php";

    return get_query_template( 'single', $templates );
}

And at the end of get_query_template the filter is applied like so:

return apply_filters( "{$type}_template", $template, $type, $templates );

So, as you can see, the filter is called with some default templates passed as param. And this means that your condition wont be true:

function myevent( $template ) {
    if ('event' == get_post_type(get_queried_object_id()) && !$template) {
        // the part with !$template will be fals, so this code won't run
        $template = dirname(__FILE__) . '/single-event.php';
    }
    return $template;
}
add_action( 'single_template', 'myevent');

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