Hello,
working with Gutenberg 4.3.0 and ACF Pro 5.8.0-beta2, I use a callback function to include a block template in PHP like in the example: https://www.advancedcustomfields.com/blog/acf-5-8-introducing-acf-blocks-for-gutenberg/
I need to access the post ID in that template. It seems obvious:
global $post
and go on.
But… It works only on the front-end; $post returns NULL at the admin side in block preview and edit window. I also tried $_GET[‘post’] to grab the ID but without success.
Am I missing something?
PS: Additionally I’d be happy to access the same ID (on edit screen) in filters like ‘acf/load_value’ or ‘acf/load_field’ but I can’t…
Digging through code, it appears that Gutenberg blocks are just custom post type. What’s happening is that block (and so their previews) are standalone: $post_id is actually the block ID! On the frontend, blocks are rendered inside a post, but it’s not always the case. So the problem is a little trickier than I first thought…
I found a temporary workaround though: add this (second line) in /wp-content/plugins/advanced-custom-fields-pro/includes/gutenberg/blocks.php line 403:
// render_callback vars
$content = ”;
$is_preview = true;
$block[‘data’][‘post_id’] = acf_maybe_get_POST(‘post_id’);
Next edit your custom block template, add this at the top:
if(!$GLOBALS[‘post’] && $block[‘data’][‘post_id’]) {
setup_postdata($GLOBALS[‘post’] =& get_post($block[‘data’][‘post_id’]));
}
And don’t forget to add this too at the end:
wp_reset_postdata()
Now you can access current parent post datas. Functions like the_title() work too.
Hope it helps, and hope ACF team will find a cleaner way to add this feature 🙂
Hi, thanks for pointing to acf_maybe_get_POST()! As I don’t want to edit core files, I wrote a helper which works for me so far within the block template:
function my_acf_post_id() {
if ( is_admin() && function_exists( 'acf_maybe_get_POST' ) ) :
return intval( acf_maybe_get_POST( 'post_id' ) );
else :
global $post;
return $post->ID;
endif;
}
Definitely, I agree that a block instance should contain the post ID or it should be accessible in another elegant way.
Good call, didn’t think we could use acf_maybe_get_POST('post_id') on the frontend! Much cleaner, thanks.
It seems that we’ve got it as a parameter in beta3!
function render_callback( $block, $content = '', $is_preview = false, $post_id = 0 ) {...}
