How to have this permalink structure: post_type/postname/custom_inner_page

Question

Imagine I have a custom post type called City with custom related meta.

The following is working just fine:

mysite.com/city/new-york/

However, I would like to have an "inner" page listing stuff related to that post in the following way:

mysite.com/city/new-york/stores

Inside of which I would query for something like

post_type='stores',
category='new-york'

If an editor adds another city it should work with no additional coding.

And then hopefully have posts linked as:

mysite.com/city/new-york/stores/apple

I've been searching for this for a while and still haven't figured it out. Maybe I'm approaching it the wrong way.

Asfar as I know, mysite.com/city/new-york can't be a custom taxonomy because I need it to be a full featured page, with meta boxes and featured image.

Answer 1

Register your taxonomy first and set the argument slug and rewrite rules to your slug which is city

Register your post type with slug of your taxonomy city prefixed and make sure you set the has_archive argument to taxonomy.

Now add a filter to post_type_link to make the stores show the individual permalink.

register_post_type(
    'city',
    array(
        'rewrite' => array( 'slug' => 'city/%stores%', 'with_front' => false ),
       'has_archive' => 'city',
       // additional args
    )
);


register_taxonomy(
  'stores',
  'city',
   array(
    'rewrite' => array( 'slug' => 'city', 'with_front' => false ),
    // your other args...
)
);

function yourprefix_store_permalinks( $post_link, $post ){
  if ( is_object( $post ) && $post->post_type == 'city' ){
      $terms = wp_get_object_terms( $post->ID, 'stores' );
      if( $terms ){
          return str_replace( '%stores%' , $terms[0]->slug , $post_link );
      }
  }
  return $post_link;
}
add_filter( 'post_type_link', 'yourprefix_store_permalinks', 1, 2 );

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Hope this is what you are looking for. If not you can read about similar article by https://wordpress.stackexchange.com/questions/199456/custom-taxonomy-post-slug-permalink