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-rw-r--r--activerecord/test/cases/serialized_attribute_test.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/test/cases/serialized_attribute_test.rb b/activerecord/test/cases/serialized_attribute_test.rb
index 5d341707eb..64b184765c 100644
--- a/activerecord/test/cases/serialized_attribute_test.rb
+++ b/activerecord/test/cases/serialized_attribute_test.rb
@@ -374,7 +374,7 @@ class SerializedAttributeTest < ActiveRecord::TestCase
end
def test_serialized_attribute_works_under_concurrent_initial_access
- model = Topic.dup
+ model = Class.new(Topic)
topic = model.create!
topic.update group: "1"