adr VS adr-example

This is one of the questions Action Domain Responder seeks to answer. The answer for Actions in ADR is the same answer as for a Controller action method in MVC.

First, this is an excellent question. But to answer it, we need to define some terms. Do you mean "action" as in ADR, where the action class is what would have been a controller action method (aka "single-action controller")? Or do you mean "action" as the Laravel folks often use it, a la https://laravelactions.com/ ?

With that in mind, MVU strikes me as being a lot like Action Domain Responder. (I've not heard of MVU before.)

Oh sorry, it means Action Domain Responder, it's a design pattern akin to MVC ( and it's nuances like MVVC ) or DDD. This is the blog of Jones, the person who coined that pattern : http://pmjones.io/adr/

ADR (as opposed to MVC) - direct link - example

Contra /u/dave8271 below, I think it does matter. There are many different ideas about MVC, and as such it's not a very clear vocabulary term, esp. on the server side. The Action Domain Responder pattern exists to help clarify some of those distinctions.

At first I read this as (my paper on) ADR vs MVC. You may wish to consider the ADR pattern over MVC for an API system.

Ah, thanks for saying! As far as one class per route, it's more in line with Action Domain Responder than with what we usually think of as MVC.

This is it: https://github.com/pmjones/adr/blob/master/MVC-MODEL-2.md

cough Action Domain Responder cough

Adding to the above link a full ADR Example - https://github.com/pmjones/adr-example

Yes, as an example, the First Application's business logic (not that it's much) doesn't tie itself to the framework, as one example. Odan's Slim Skeleton, ADR Example (yes, I know you are the author), and the Aura Payload example class can be seen as other examples.

ADR (as opposed to MVC) - direct link - example

https://github.com/pmjones/adr-example - Follow up example to the above. ADR is an alternative to MVC

More on ADR (like MVC) - https://github.com/pmjones/adr-example

Another option, to me and speaking to the OP as an alternative, it is simpler to add some Data Mappers/Repositories to abstract away the Database code. Good examples is the sample ADR application, Payload library example, Slim 3 First Application, or this Slim 4 Skeleton application

Simple example of a MVC/ADR (Action-Domain-Responder, similar to MVC) system - https://github.com/pmjones/adr-example

Call your class (which doesn't look like a controller anymore...), then, output it to your HTML or JSON renderer, based on the check. You can do this in a class (or 2 - look up ADR - https://github.com/pmjones/adr-example) or in the router.