1 files changed, 19 insertions, 0 deletions
diff --git a/railties/lib/rails/deprecation.rb b/railties/lib/rails/deprecation.rb
new file mode 100644
index 0000000000..89f54069e9
--- /dev/null
+++ b/railties/lib/rails/deprecation.rb
@@ -0,0 +1,19 @@
+require 'active_support/deprecation/proxy_wrappers'
+
+module Rails
+  class DeprecatedConstant < ActiveSupport::Deprecation::DeprecatedConstantProxy
+    def self.deprecate(old, current)
+      # double assignment is used to avoid "assigned but unused variable" warning
+      constant = constant = new(old, current)
+      eval "::#{old} = constant"
+    end
+
+    private
+
+    def target
+      ::Kernel.eval @new_const.to_s
+    end
+  end
+
+  DeprecatedConstant.deprecate('RAILS_CACHE', '::Rails.cache')
+end