Entity hierarchy?

[hw762]

I am trying to find out a way to express one-to-many relationship in Fleks. Say I have multiple Units, each can have a number of Weapons. Each Unit and Weapon also have a number of components.

Is this possible? I don't see a way to, say, add a "child entity".

[Quillraven]

Not sure if this is a Fleks specific question. The way I usually solve entity relations is via components. I don't know if this is the best way to do it but it works for me.

As an idea how I would solve your problem:

1. Units are entities with components
2. Weapons are entities with components
3. Create an Equipment component which has a list of entities (=weapons)
4. Add this component to a unit and you have your connection between unit and weapons

I use a similar approach for collision handling. I usually have a Collision component that is added to an entity and contains a list of entities that it collided with within one frame.
You can have a look at this approach in my MysticGarden game: https://github.com/Quillraven/MysticGarden/blob/kotlin/core/src/main/kotlin/com/github/quillraven/mysticgarden/component/Collision.kt

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Anyway, I suggest to solve entity relations via components as well. That should be the most flexible solution.

[hw762]

Shoulc I be using EntityBag? I can't seem to construct it. Or is it fine to just use List instead?

[Quillraven]

EntityBag is just an interface. You can use MutableEntityBag which is the implementation or just go with List. I think there is no big difference ;)