Rails Ruby on Rails

% irb
> require 'action_dispatch'
 => true 
> ActionPack::VERSION::STRING
 => "3.0.4" 
> ActionDispatch::Request
NoMethodError: undefined method `deprecate' for ActionDispatch::Request:Class
        from .../actionpack-3.0.4/lib/action_dispatch/http/request.rb:146:in `<class:Request>'
        from .../actionpack-3.0.4/lib/action_dispatch/http/request.rb:11:in `<module:ActionDispatch>'
        from .../actionpack-3.0.4/lib/action_dispatch/http/request.rb:10:in `<top (required)>'
        from (irb):3
>

The problem seems to be a missing

require 'active_support/core_ext/module/deprecation'

in action_dispatch/http/request.rb

This only really shows up if you load parts of the framework in an unusual order (e.g. the example code above). Most people won't run into it because the relevant ActiveSupport stuff will usually be loaded by other parts of the framework before ActionDispatch::Request gets referenced. However, I ran into it because I have some framework-extending code that loads ActionDispatch::Request in isolation, so I'm reporting this.

This first appeared in 3.0.4