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-rw-r--r--activerecord/lib/active_record/attribute_set.rb8
1 files changed, 7 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/attribute_set.rb b/activerecord/lib/active_record/attribute_set.rb
index ee278388a4..026b3cf014 100644
--- a/activerecord/lib/active_record/attribute_set.rb
+++ b/activerecord/lib/active_record/attribute_set.rb
@@ -60,8 +60,14 @@ module ActiveRecord
super
end
+ def deep_dup
+ dup.tap do |copy|
+ copy.instance_variable_set(:@attributes, attributes.deep_dup)
+ end
+ end
+
def initialize_dup(_)
- @attributes = attributes.deep_dup
+ @attributes = attributes.dup
super
end