Add is_post_type_viewable filter

[powerbuoy]

It would be great if we could hook into is_post_type_viewable() and override the check.

We've created a new config for post types; has_single, which works very much like has_archive only it disables single pages for a post-type (useful for post-types such as office or employee which usually in our cases only have archive pages).

However, even though the post-type shows a 404 on single (using template_redirect), inside the admin the "View"-links and "Permalink" settings still show up. It seems the easiest way to hide everything related to single pages is to simply return false from is_post_type_viewable().

[powerbuoy]

Thinking about it, an even better solution would probably be to add official support for has_single :)

[powerbuoy]

Found a duplicate of that: #43347 but seems abandoned. Perhaps adding an is_post_type_viewable filter will be easier?

[donmhico]

Hi @powerbuoy,

Thank you for the ticket. 49628.diff introduces a new filter post_type_viewable which exposes $post_type to allow users to return either true or false depending on their needs.

[peterwilsoncc]

Related #49380

[peterwilsoncc]

@donmhico Minor note for the docs, when the filter is called $post_type will always be a WP_Post_Type object. If the function was passed a string it will be converted by that point.

[deepaklalwani]

Update filter and $post_type parameter description

[SergeyBiryukov]

Moving to a future release for now to handle with #49380.