Fix a bug in ActionDispatch::Static where Rails cannot find assets if started in another directory which is not the RAILS_ROOT.

3 files changed, 13 insertions, 3 deletions

diff --git a/railties/lib/rails.rb b/railties/lib/rails.rb
index 085b82c154..0611b2a9f5 100644
--- a/railties/lib/rails.rb
+++ b/railties/lib/rails.rb
@@ -92,11 +92,12 @@ module Rails
     end
 
     def public_path
-      @@public_path ||= self.root ? File.join(self.root, "public") : "public"
+      application && application.paths.public.to_a.first
     end
 
     def public_path=(path)
-      @@public_path = path
+      ActiveSupport::Deprecation.warn "Setting Rails.public_path= is deprecated. " <<
+        "Please set paths.public = in config/application.rb instead.", caller
     end
   end
 end
diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index f9f47ef679..7ce3494fa6 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -137,7 +137,7 @@ module Rails
 
       def default_middleware_stack
         ActionDispatch::MiddlewareStack.new.tap do |middleware|
-          middleware.use('::ActionDispatch::Static', lambda { Rails.public_path }, :if => lambda { serve_static_assets })
+          middleware.use('::ActionDispatch::Static', lambda { paths.public.to_a.first }, :if => lambda { serve_static_assets })
           middleware.use('::Rack::Lock', :if => lambda { !allow_concurrency })
           middleware.use('::Rack::Runtime')
           middleware.use('::Rails::Rack::Logger')
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index 97d5f64708..8bf0f09d6b 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -184,6 +184,15 @@ module ApplicationTests
       end
     end
 
+    test "config.paths.public sets Rails.public_path" do
+      add_to_config <<-RUBY
+        config.paths.public = "somewhere"
+      RUBY
+
+      require "#{app_path}/config/application"
+      assert_equal File.join(app_path, "somewhere"), Rails.public_path
+    end
+
     def make_basic_app
       require "rails"
       require "action_controller/railtie"