A Roadmap to Entity Relationships

[HexDecimal]

I've been using Sander Mertens articles to implement relationships. I've implemented these in the basic sense but they also have an article that describes a roadmap for a more complete implementation.

• Components as entities - Python objects natively support what this is trying to do
• Callbacks on state changes #6
• Support relationship pairs in archetype storage
• Relationship components - Already added
• Wildcard queries - Half of this is implemented
• The component index
• Cleanup
• Cleanup traits
• Multi-source queries
• Relationship traversal
• Query cache revalidation
• Breadth first traversal
• Uncached queries
• Multi component observers
• Event propagation
• Empty table optimization
• Garbage collection
• Rule engine
• Exclusive relationships - Already added as an alternative syntax for relationship access
• Inheritance #12
• Query DSL - Probably not needed for a Python library

I don't know if I'll ever complete this. Some of these might be too slow when implemented in pure-Python and if I were to make a C extension then I may as well just port Flecs itself to Python.

It's clear that these features will be incredibly useful once added. At the very least I should keep all of these in mind as I work on this module.