Redirect to post with only post ID in the URL vs post_type/post ID

Question

The title may be a little confusing, I don't know how to word it to be short.

Right now my permalink structure is /%post_id%/%postname% so the final URL is /post_type/%post_id%/%postname%.

When I go to domain.com/post_id then it redirects to domain.com/post_type/%post_id%/%postname% but when I got to domain.com/post_type/post_id it doesn't redirect but shows the correct post.

I'm not sure how to make it work the way the default redirect works.

Answer 1

I used the following plugin lately:
https://github.com/kasparsd/numeric-shortlinks
to get post ID based shortlinks, like http://domain.com/123. That worked very well for me, with a couple of custom post types too.

On a sidenote, I'm not sure about your permalink structure, especially because %post_id% and %postname% are both uniquely referring to the same post, but on the other hand you might have a good reason for choosing the structure exactly like that.

In reference to Matthew's comment i used the following in my register_post_type() call in above mentioned project:

        'rewrite'   => array(   'slug' => '/%post_type%',
                                'with_front' => false,
                                'pages' => true,
                                'feeds' => '',
                                'ep_mask' => 1 )

It's just the rewrite part and of course you have to replace %post_type% accordingly - I also should mention that the settings for the permalinks would be set to just %postname%.