Module: EcsRails::Lazy
- Defined in:
- lib/ecs_rails/lazy.rb
Overview
Lazy / virtual components: a component costs nothing until it holds something.
Implements RFC-0006 and closes the gap RFC-0004 knowingly left in
architecture.md §3 — entity.email now always returns an Email.
user = User.create! # one INSERT, into entities. Nothing else.
user.email # => #<Email address: nil, verified: false>
user.email.persisted? # => false — no row, and none wanted
user.save! # still no emails row
user.email.address = "[email protected]"
user.save! # *now* one INSERT into emails
The whole feature is two questions: which component instance does the reader hand back (Entity#ecs_component), and does that instance deserve a row (Component#ecs_dirty?). Everything else here is bookkeeping in service of those two.