How to change group from abstract engines

[sebas77]

Hello good Svelto people, we are currently looking into Svelto as a means to build a maintainable and extensible framework for more than just a single game. Currently, we have a question on how to handle abstract engines when switching entities between group compounds.
Let's say there are Selectable entities of different shape for example Unit and Building and we have an abstract engine that handles the selection logic. When a Selectable entity is clicked then the entity should be marked as Selected but to do so the abstract engine needs to know the group compound of the specific entity to switch to (e.g. SelectedUnit, SelectedBuilding). This leads to a maintenance problem when that code is shared between multiple applications which need selection to work on different or additional entity shapes.
How would one approach this problem using Svelto?

[sebas77]

yes there is an extension that I am going to integrate officially soon(TM). This extension is already used in production so it will work

https://gist.github.com/jlreymendez/c2f441aaf6ac7b5f233ecd990314e9cc

remember that highly abstracted engines don't need this really, they can work just with FindGroups . this is sort of for middle-level abstraction.

it's recommended to read these articles:

https://www.sebaslab.com/ecs-abstraction-layers-and-modules-encapsulation/
https://www.sebaslab.com/whats-new-in-svelto-ecs-3-0/