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# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
rescue_from(ActionController::RoutingError) {
render :template => 'errors/404'
}
end
# config/initializers/show_exceptions.rb
require 'action_dispatch/middleware/show_exceptions'
module ActionDispatch
class ShowExceptions
private
def render_exception_with_template(env, exception)
body = ErrorsController.action(rescue_responses[exception.class.name]).call(env)
log_error(exception)
body
rescue
render_exception_without_template(env, exception)
end
alias_method_chain :render_exception, :template
end
end
# app/controllers/errors_controller.rb
class ErrorsController < ApplicationController
ERRORS = [
:internal_server_error,
:not_found,
:unprocessable_entity
].freeze
ERRORS.each do |e|
define_method e do
respond_to do |format|
format.html { render e, :status => e }
format.any { head e }
end
end
end
end
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