Reference exception in rack.errors

lib/lotus/action/throwable.rb

@@ -102,11 +102,19 @@ def _rescue
           begin
             yield
           rescue => exception
+            _reference_in_rack_errors(exception)
             _handle_exception(exception)
           end
         end
       end
 
+      def _reference_in_rack_errors(exception)
+        if @_env['rack.errors']
+          @_env['rack.errors'].puts(exception)
+          @_env['rack.errors'].flush
+        end
+      end
+
       def _handle_exception(exception)
         raise unless configuration.handle_exceptions
         halt configuration.exception_code(exception.class)

test/integration/rack_errors_test.rb

@@ -0,0 +1,41 @@
+require 'test_helper'
+require 'lotus/router'
+
+ErrorsRoutes = Lotus::Router.new do
+  get '/without_message', to: 'errors#without_message'
+  get '/with_message',    to: 'errors#with_message'
+end
+
+AuthException = Class.new(StandardError)
+
+class ErrorsController
+  include Lotus::Controller
+
+  action 'WithoutMessage' do
+    def call(params)
+      raise AuthException
+    end
+  end
+
+  action 'WithMessage' do
+    def call(params)
+      raise AuthException, %q{AuthException: you're not authorized to see this page!}
+    end
+  end
+end
+
+describe 'Reference exception in rack.errors' do
+  before do
+    @app = Rack::MockRequest.new(ErrorsRoutes)
+  end
+
+  it 'adds exception to rack.errors' do
+    response = @app.get('/without_message')
+    response.errors.must_equal "AuthException\n"
+  end
+
+  it 'adds exception message to rack.errors' do
+    response = @app.get('/with_message')
+    response.errors.must_equal "AuthException: you're not authorized to see this page!\n"
+  end
+end