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-rw-r--r--actionpack/lib/action_controller.rb1
-rw-r--r--actionpack/lib/action_controller/base.rb1
-rw-r--r--actionpack/lib/action_controller/metal/etag_with_flash.rb16
3 files changed, 18 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller.rb b/actionpack/lib/action_controller.rb
index fc86a907b3..50f20aa789 100644
--- a/actionpack/lib/action_controller.rb
+++ b/actionpack/lib/action_controller.rb
@@ -23,6 +23,7 @@ module ActionController
autoload :Cookies
autoload :DataStreaming
autoload :EtagWithTemplateDigest
+ autoload :EtagWithFlash
autoload :Flash
autoload :ForceSSL
autoload :Head
diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index 68a526eccb..ca8066cd82 100644
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -213,6 +213,7 @@ module ActionController
Renderers::All,
ConditionalGet,
EtagWithTemplateDigest,
+ EtagWithFlash,
Caching,
MimeResponds,
ImplicitRender,
diff --git a/actionpack/lib/action_controller/metal/etag_with_flash.rb b/actionpack/lib/action_controller/metal/etag_with_flash.rb
new file mode 100644
index 0000000000..474d75f02e
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/etag_with_flash.rb
@@ -0,0 +1,16 @@
+module ActionController
+ # When you're using the flash, it's generally used as a conditional on the view.
+ # This means the content of the view depends on the flash. Which in turn means
+ # that the etag for a response should be computed with the content of the flash
+ # in mind. This does that by including the content of the flash as a component
+ # in the etag that's generated for a response.
+ module EtagWithFlash
+ extend ActiveSupport::Concern
+
+ include ActionController::ConditionalGet
+
+ included do
+ etag { flash unless flash.empty? }
+ end
+ end
+end