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I'm using wordpress.com's public REST API to retrieve custom posts from a Wordpress installation. The JSON that's being returned is missing all the custom fields, however. The fields are definitely there and working, because I can filter on them. For example this URL:

https://public-api.wordpress.com/rest/v1/sites/swnfest.com/posts/?type=artist&meta_key=facebook&meta_value=outfitoutfitoutfit

is successfully limiting based on the facebook custom field, but that field isn't present in the response. Judging by the criteria for including custom fields in this article:

If the user performing the request is unauthenicated, he or she will not be able to add, edit or delete any metadata; will be able to read any metadata for which the key doesn’t begin with _ but will not be able to read any metadata which begins with _ unless it is whitelisted.

the field should be appearing. Is there something I'm missing, or is this a bug?

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wordpress.com customizations are off topic here. Please ask their support. –  toscho Sep 13 '13 at 9:17
    
Please excuse my ignorance because I know nothing about Wordpress - but this isn't anything to do with wordpress.com (bar using their public API) - the site in question is a private wordpress installation. To my knowledge nothing has been customised, beyond the post type which is custom. Is that what you're referring to? –  Craig Sep 15 '13 at 19:17

1 Answer 1

Try using the rest_api_allowed_public_metadata filter to whitelist the facebook custom field. It will then appear in the response:

add_filter( 'rest_api_allowed_public_metadata', 'jeherve_allow_fb_metadata' );
function jeherve_allow_fb_metadata() {
    // only run for REST API requests
    if ( ! defined( 'REST_API_REQUEST' ) || ! REST_API_REQUEST )
        return $allowed_meta_keys;

    $allowed_meta_keys[] = 'facebook';

    return $allowed_meta_keys;
}
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Thanks; I have similar code in place but it doesn't make any difference. I raised this with Jetpack support and they think it's a problem on their end, so I'm waiting to see what happens with that. –  Craig Sep 22 '13 at 22:12

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