View all resources with World.resources()

[alice-i-cecile]

What problem does this solve or what need does it fill?

It would be useful to be able to see which Resources exist in the world, for debugging, discovery and editor purposes.

What solution would you like?

Expose a .resources() method on World.

What alternative(s) have you considered?

This may exist and I missed it. In that case, organization or documentation needs work instead.

Additional context

This appears to have been lost in #1525; this functionality exists in 0.4, but not in 0.5. Edit: I was mistaken about behavior in 0.4; this is new functionality.

Resources are now a part of World, but it doesn't seem to be accessible from that.

[mockersf]

there is get_resource https://docs.rs/bevy/0.5.0/bevy/ecs/world/struct.World.html#method.get_resource for inspiration on how to list resources

[Sheepyhead]

It's not really obvious what this .resources() method should actually return, as a resource can be any type. Clarification is needed on what the returned values of this function needs to be used for, and what data should be returned

[concave-sphere]

It might be worth having a set of debug specific APIs that return types that are easy to dump to stdout or logs. e.g, get_all_resource_names(&self) -> String. I've also had cause to implement my own code to get a String showing which components are attached to an Entity.

[Frizi]

I don't think there is any actual regression. There never was a way to access a list of resources. As far as I can tell not even a Debug impl. All methods on the Resources struct were generic over a resource type, thus serving the same purpose as existing World. So, maybe we want something like that, but I would argue it should be designed as targeted for specific use case (probably editor).

[alice-i-cecile]

Closely related to #1130.

[alice-i-cecile]

There's some nice external-APIs only example code that does approximately this over on bevy-cheatbook/bevy-cheatbook#61 :)

[alice-i-cecile]

Duplicate of #3007, which has more progress.