Make Activerecord Observers not load observed models -> faster/safer environment boot.

• faster tests + console
• able to boot environment without/with empty/with old database

gem install lazy_observers

class FooObserver < ActiveRecord::Observer
  lazy_observe "User", "Foo::Bar"

  ...
end

LazyObservers.on_load("Arturo::Feature") do |klass|
  klass.class_eval do
    ... funky hacks ...
  end
end

LazyObservers.debug_active_record_loading

script/console or rails c

Loads all classes registered via observers, to make sure you did not misspell
(negates the effect of lazyness, so only use for debugging)

LazyObservers.check_classes

• .on_load is called before all methods are defined on the baseclass, so they might not be defined
• do not use observe and lazy_observe in the same observer (and if you have to, use observe after lay_observe)
• do not use Model classes with class-methods of the observer e.g. class FooObserver; Foo.something{}; def after_update; end; end

Michael Grosser
michael@grosser.it
License: MIT