Comments on: Saving Post Meta Field Revisions in WordPress

By: Josh

Josh — Fri, 28 Sep 2012 22:03:59 +0000

Thanks. I got it working easily enough by bringing in the global $post object to that function.

I owe you a beer (or six).

By: John Blackbourn

John Blackbourn — Fri, 28 Sep 2012 21:04:51 +0000

If you want to introduce logic to determine which fields to show based on post type then you'll have to use something like the get_current_screen() object. There may be other parameters passed to that filter, but I don't know off the top of my head.

By: Josh

Josh — Fri, 28 Sep 2012 20:58:34 +0000

Thanks for the response.

So in the case of multiple types of custom fields, e.g. a custom post type with some of its own custom meta fields and other custom meta fields for pages, would that function be able to selectively output fields based on the type of post?

i.e. is anything passed to that function that would help determine which fields to return?

By: John Blackbourn

John Blackbourn — Fri, 28 Sep 2012 19:19:23 +0000

Hi Josh,

In the plugin the function pmr_fields() is the function which outputs the fields on the Revisions screen. It’s the bit explained in the “Displaying the meta field on the revisions screen” section in the post above.

Hope this helps. John.

By: Josh

Josh — Fri, 28 Sep 2012 18:45:05 +0000

Found this page and it’s very helpful, however something I’m not seeing explained is the function in the plugin file, pmr_fields. Can you elaborate on what this function does and why it is there?

Thanks again, this is very helpful information.

By: John Blackbourn

John Blackbourn — Wed, 25 Jul 2012 21:06:33 +0000

You’re right Roman, the revision comparison functionality doesn’t take post meta fields into account, and if the other post fields are the same then it’ll give you the “These revisions are identical” message.

I’m sure there’s a ticket on WordPress’ Trac regarding improvements to the revisions screen, but for the life of me I can’t find it. I’m sure it covered this situation too.

By: Roman

Roman — Wed, 25 Jul 2012 11:37:41 +0000

Great tip. It seems to work, except one little thing: If i hit the “Compare Revisions” button, I always get “These revisions are identical.”, but using “get_post_meta” on the revision ID, I can see the “old” meta values. Restoring works also, only the compare function doesn’t work properly.

Cheers
Roman

By: HKawaii

HKawaii — Mon, 11 Jun 2012 19:20:58 +0000

Wow this is very useful! I hope this works with WordPress 3.3.2. Going to give it a try.