1 files changed, 22 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/deep_dup.rb b/activesupport/lib/active_support/core_ext/object/deep_dup.rb
new file mode 100644
index 0000000000..2c4383ac94
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/object/deep_dup.rb
@@ -0,0 +1,22 @@
+class Object
+  # Returns a deep copy of object if it's duplicable.
+  def deep_dup
+    duplicable? ? dup : self
+  end
+end
+
+class Array
+  # Returns a deep copy of array.
+  def deep_dup
+    map { |it| it.deep_dup }
+  end
+end
+
+class Hash
+  # Returns a deep copy of hash.
+  def deep_dup
+    each_with_object(dup) do |(key, value), hash|
+      hash[key.deep_dup] = value.deep_dup
+    end
+  end
+end