How to use Single Table Inheritance with Modules

Rails
1

So, I have a table…

events

id int
type varchar(255)
data text

Which I’m using to log some simple system events…

class Event < ActiveRecord::Base
end

I’d like to file quite a lot of events in here, and load them later
into a general parsing and display system for the events. However,
what I’d really like to do is:

class Component::FooBarEvent < ActiveRecord::Base
end

new_event = Component::FooBarEvent.create :data => {“msg” =>“Hello
world”}
assert( new_event == Event.find_by_id(new_event.id) )

instead what I get is…
LoadError: Expected /home/bramski/source/trunk/config/…/app/models/
events/component_events/foo_bar_event.rb to define FooBarEvent

If I look in the SQL I see…
SQL (0.000269) INSERT INTO events ( type, data,
eventable1_type, foreign_id) VALUES(‘TestEvent’, ‘— \nmsg:
Hello world\n’)

Now… I should never see the above LoadError for the missing constant
as Component::FooBarEvent is already defined. What is confusing here
is, why is rails putting in the unqualified constant for the object
(FooBarEvent) as opposed to the fully qualified constant name
(Component::FooBarEvent).

Is there a way to get rails to store and load Component::FooBarEvent
as the type, rather than just FooBarEvent?

2

Hey,

How about either

renaming Component::FooBarEvent to ComponentEvents::FooBarEvent

or

renaming the directory component_events to component ?

Cheers,
Yuri

On 5/9/07, [email protected] [email protected] wrote:

new_event = Component::FooBarEvent.create :data => {“msg” =>"Hello
Hello world\n’)

–
Best regards,
Yuri L.

3

That doesn’t really do anything, I still don’t get ActiveRecord
storing as “type” => “ComponentEvents::FooBarEvent”, I get “type” =>
“FooBarEvent”, and rails is unable to locate the class
“Object::FooBarEvent” because it’s “ComponentEvents::FooBarEvent”.