Make Activerecord Observers not load observed models -> faster/safer environment boot.
- faster tests + console
- able to boot environment without/with empty/with old database
Recommended: turn your observers into modules
```Ruby
module CachingObserver
def self.included(base)
this = self
base.after_save { |record| this.do_something(record); true }
end
def self.do_something(record)
... do something ...
end
end
```
Install
=======
gem install lazy_observers
Usage
=====
class FooObserver < ActiveRecord::Observer
lazy_observe "User", "Foo::Bar"
...
end
### Extend models from gems after they are loaded
LazyObservers.on_load("Arturo::Feature") do |klass|
klass.class_eval do
... funky hacks ...
end
end
### Catch models that are loaded in application startup.
LazyObservers.debug_active_record_loading
`script/console` or `rails c`
### Verify you did not misspell
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
TIPS
====
- .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
Author
======
[Michael Grosser](http://grosser.it)
michael@grosser.it
License: MIT
[![Build Status](https://secure.travis-ci.org/grosser/lazy_observers.png)](http://travis-ci.org/grosser/lazy_observers)