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There's a gem, which appends a before_filter to a Rails app: class Railtie < Rails::Railtie initializer "..." do ActiveSupport.on_load(:action_controller) do ActionController::Base.send(:include, Filter) ... module Filter extend ActiveSupport::Concern included do append_before_filter :set_locale end def set_locale .... And here's some controller in the app: class DesktopsController < ApplicationController before_filter :set_language_in_session Now the problem with this is that the before_filter from the gem is being put in the filter chain before the before_filter from the DesktopsController: DesktopsController._process_action_callbacks.select { |c| c.kind == :before }.collect { |filter| filter.filter } => [ [0] :set_locale, [1] :set_language_in_session ] How can I make the before_filter from the gem ( set_locale ) be put after all other filters? The secret probably lies in this line: ActiveSupport.on_load(:action_controller) do But I've tried different libraries without any luck... Btw. Here's the full code of the gem. Ruby 1.9.2, Rails 3.0.5.

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