Editing broken with plugin activated

[Ива Цилкова]

Blank (white) page on post edit.

Wordpress 5.7.2

[Jonny Harris]

@plamenh How did you install the plugin? Did you run composer install?

Can you download a built version of the plugin here.

[Simon Knittel]

@plamenh Do you use Yoast? We've noticed, that adding blocks to the REST API results in a blank page (JavaScript errors which leads to Gutenberg/React not rendering) as long as Yoast is enabled.

We first tried adding blocks to the API via a simple custom plugin and then tried this plugin. It didn't make any difference.

We boilt it down to the return value of the get_callback function. Just returning an empty array works. Returning the result of parse_blocks doesn't work. However, the result doesn't change depending on if Yoast is enabled or not.

register_rest_field($post_type, 'blocks', [
  'get_callback' => function(array $post) {
    $array = parse_blocks($post['content']['raw']);

    return $array; // Doesn't work
    // return array(); // Works
  }
]);

UPDATE: It seems to be working fine if you don't use blocks as name for the new API property

[Ива Цилкова]

As a matter of fact, yes, we do use yoast. I guess we will just disable it, seems like the most straightforward fix. Thanks.

[Jonny Harris]

@simonknittel So the issue is related to yoast being installed?

[Simon Knittel]

@simonknittel So the issue is related to yoast being installed?

I guess so. Two workarounds I found:

1. Disable Yoast
2. Use some other property name than blocks

[Jonny Harris]

I believe that #18 might this fix. Watch this space.

[Jonny Harris]

@plamenh @simonknittel Can you install version 0.3.0 and see if this is still an issue?

[Ива Цилкова]

@spacedmonkey I can confirm 0.3.1 works fine with Yoast SEO turned on. Thanks.

[Tom Hopcraft]

Yep I had issue with Yoast too, but when both plugins are up to date, all is fine.