Bi-directional relationships are one of the most powerful aspects of Advanced Custom Fields in my opinion (when it comes to practical/useful application).
The goal of this tutorial is to show you how to query reviews that are specifically related to parts of a business. In this tutorial, we’ll relate reviews to specific services, but you can also relate reviews to team members, locations, service areas, and more.
By the end of this tutorial you’ll be equipped to use bi-directional relationships, repeaters, and the advanced query builder to confidently create many types of relationship queries.
As a bonus, I’ll show you how to query reviews into an OxyExtras carousel for a much more interactive reviews display.
## In this tutorial you’ll learn:
* How to create Custom Post Types for Reviews & Services
* How to create & assign Custom Fields
* How to create bi-directional relationships between post types
* How to relate reviews to a service (and vice versa)
* How to query related reviews using a repeater and the advanced query builder in Oxygen
* How to turn your related reviews repeater into a re-usable part
* How to build a good looking review card
* How to make the review headshot conditional
* How to query reviews into a grid
* How to query reviews into an off-screen carousel
* How to add custom carousel left/right navigation
* …and general tips and tricks
## Notes
At one point I used utility classes in the review card. I never do this and don’t recommend it. It was late and I clearly wasn’t thinking properly. I marked this part in the video with a “don’t do this” screen.
## Items Needed
* Custom Post Type UI (Free)
* Advanced Custom Fields Pro (Paid)
* ACF Post 2 Post (Free)
* OxyExtras (Paid – for the carousel)
