Reply To: Populate Relationship with WP REST API

• John Huebner

• September 4, 2016 at 1:00 am

The relationship field in ACF will only work with posts on the same site.

If you’re talking about another site on a multisite installation, there is a custom field add on for this https://github.com/tmconnect/acf-relationship-multisite.

If you’re talking about a completely different site, then you’d need to build a custom field type https://www.advancedcustomfields.com/resources/creating-a-new-field-type/

You could probably also do this using a simple select field and dynamically populate the choices https://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/, how you’d get those choices I can’t say.