Installing the Posts 2 Posts plugin on the latest version of WordPress—5.3.2 at the time of writing—the admin UI functions as expected and we can use create the links between posts and users. Given then notice on the plugin’s WordPress.org page, I was actually pleasantly surprised to realise this.
This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.https://wordpress.org/plugins/posts-to-posts/
To me, this a testament to the scribu the plugin author for creating a well-developed plugin, the team of core contributors who developed the block editor in a way that’s inclusive of exiting plugins, and to WordPress’ overall commitment to backward compatibility.
Options pages and list tables unchanged while the post edit UI looking dated
Let’s take a look at what the state of Post 2 Posts’ admin UI in WordPress 5. Given the WordPress 5.x updates have been focused on the post edit screen and the block editor, those are where we’ll be looking today. The options pages and list table the plugin adds all look and behave as they did it WordPress 4.x
Below is a screenshot of the default admin box display in the settings sidebar. This appears in the expected location and the custom
title attributes provided as part of the connection registration flow through to the setting panel. Nice
Posts 2 Posts also allows the admin metabox to be located below the block editor. Let’s take a look.
All things considered, this is a workable state.
Looking further ahead, I see the styling of the UI controls as something we can improve. I’m looking to rebuild the Posts 2 Posts metaboxes to aline with the block editor developer conventions, design best practices, and reuse existing core components where possible.