Allow selected post meta keys to be tracked in revisions.

Adam Silverstein

This plugin implements a post meta revisioning feature as arrived at in https://core.trac.wordpress.org/ticket/20564.
The goal of releasing this code as a plugin is to allow as many people as possible to easily test the post meta revisioning feature, and also hopefully move towards inclusion of the feature into core, following the <a href="https://make.wordpress.org/core/features-as-plugins/" rel="nofollow ugc">Features as Plugins</a> model.
Further development of the code for this plugin will continue on its <a href="https://github.com/adamsilverstein/wp-post-meta-revisions" rel="nofollow ugc">GitHub repository</a>. Pull requests welcome!
To use this plugin, you must be running WordPress 4.1 or newer, two hooks were added in 4.1 that are required for this implementation.
To revision a post meta, you add its key via a filter:
<pre>
function add_meta_keys_to_revision( $keys ) {
 $keys[] = 'meta-key-to-revision';
 return $keys;
}
add_filter( 'wp_post_revision_meta_keys', 'add_meta_keys_to_revision' );
</pre>
Features:
<ul>
<li>Allows for a whitelisted array of ‘revisioned’ meta keys (which can change at any time)</li>
<li>A revision for the meta is stored on save (if the meta value has changed)</li>
<li>A meta revision save (if changed) is also triggered during auto-saves</li>
<li>Restoring a revision restores the revisioned meta field’s values at that revision (including auto-saves)</li>
<li>Supports storing of multiple values for a single key (and restoring them)</li>
<li>Adds revisioned meta to the preview data via get_post_metadata</li>
<li>Includes unit tests demonstrating feature</li>
<li>Travis CI tests integrated with GitHub repository, props @mattheu</li>
</ul>

WP-Post-Meta-Revisions

DUDE! Why did I never think of this before? This is an awesome idea! I haven't even installed the plugin and you are getting five stars straight off the bat for solving a problem I didn't even know I had.
Thanks :)



Freakin' sweet!


I assume it used to work, didn't work for me.


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