How to make Rails 3 reload STI classes in development mode?

After switching to Rails 3, I noticed that I have to reboot my server to make STI model classes reload with each request. For example, suppose I have this:

# app/models/vehicle.rb
class Vehicle < ActiveRecord::Base
end

# app/models/car.rb
class Car开发者_StackOverflow社区 < Vehicle
end

If I make a change to Vehicle, the change is loaded on the next request. But if I make a change to Car, I have to reboot my server for it to load.

Any ideas on fixing this?

I'm running WEBrick, but I'm not committed to it.

We found that we needed both zetetic's solution and some additional code to make this work (at least in Rails 3.0.9). For the above problem, the solution would look something like:

In config/environments/development.rb:

  config.after_initialize do
    ["vehicle"].each do|dep|
      require_dependency( (Rails.root + "app/models/#{dep}").to_s )
    end
  end

In app/controllers/application_controller.rb:

class ApplicationController < ActionController::Base
  if Rails.env == 'development'
    require_dependency( (Rails.root + "app/models/vehicle").to_s )
  end
...

The code in development.rb handles the initial loading of the class, and the code in ApplicationController handles subsequent requests.

I believe this can be solved by adding require_dependency 'vehicle' in the controller.

Using rails 3.0.3 and passenger 3, I don't see this at all. If updating your app to 3.0.3 doesn't fix it, I'd move off of WEBrick.

I personally recommend using something other than WEBrick anyway. Passenger has been my server of choice for development + production for quite a while now.