Child pages and sub-pages do not appear. Why?

Question

I have created a child page. However, when I access "http://example.com/Page/ChildPage" does not appear?

Page (filename = page.php -> content-page.php) [WORK]

Child Page (filename = page.php -> content-child-page.php) [NOT WORK]

page.php

$slug = get_post_field( 'post_name', get_post() );
echo $slug;


while ( have_posts() ) : the_post();

    get_template_part( 'template-parts/page/content' , $slug );

endwhile; // End of the loop.

Answer 1

You need to check if the page have parent to display the child page template or if he doesnt have to display the parent page template. If $post->post_parent is equal to 0 thats mean that he doesnt have a parent.

while ( have_posts() ) : the_post();
    $template = ($post->post_parent == 0) ? 'page' : 'child-page';
    get_template_part( 'template-parts/page/content' , $template );
endwhile; // End of the loop.