Include custom post type slug as body class

[danielbachhuber]

If I have a custom post type product and a post with slug laptop, then I can create a single-product-laptop.php template to render markup specific to this product.

But, a template needs styles too. It would be easier to target my CSS specific to this template if single-product-laptop was included as a body class.

[MatheusGimenez]

add body class single-{post_type_slug}-{post_name}

[SergeyBiryukov]

Previously suggested in #18118, wontfixed as an "antipattern".

[danielbachhuber]

Replying to SergeyBiryukov:

Previously suggested in #18118, wontfixed as an "antipattern".

For this thread, @ericlewis's comment:

I think this is an antipattern.

Slugs are mutable by content editors. I've been bitten by implementing what's suggested here and having clients change slugs, then they lose styling on X page and not knowing why.

I don't think Eric's comment is consistent with WordPress' existing behavior.

In the scenario I described initially, the template is loaded based on the post slug. If the slug were to change, then the template would no longer load.

[SergeyBiryukov]

39493.2.diff​ adjusts the patch from #18118 and includes unit tests.

​CSS classes support Unicode characters, so ideally this should support multibyte post slugs in a way similar to #37655, but apparently #33924 is a blocker for that.