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-rw-r--r--activerecord/test/cases/serialized_attribute_test.rb28
1 files changed, 28 insertions, 0 deletions
diff --git a/activerecord/test/cases/serialized_attribute_test.rb b/activerecord/test/cases/serialized_attribute_test.rb
index 673392b4c4..e1bdaab5cf 100644
--- a/activerecord/test/cases/serialized_attribute_test.rb
+++ b/activerecord/test/cases/serialized_attribute_test.rb
@@ -349,4 +349,32 @@ class SerializedAttributeTest < ActiveRecord::TestCase
topic.foo
refute topic.changed?
end
+
+ def test_serialized_attribute_works_under_concurrent_initial_access
+ model = Topic.dup
+
+ topic = model.last
+ topic.update group: "1"
+
+ model.serialize :group, JSON
+ model.reset_column_information
+
+ # This isn't strictly necessary for the test, but a little bit of
+ # knowledge of internals allows us to make failures far more likely.
+ model.define_singleton_method(:define_attribute) do |*args|
+ Thread.pass
+ super(*args)
+ end
+
+ threads = 4.times.map do
+ Thread.new do
+ topic.reload.group
+ end
+ end
+
+ # All the threads should retrieve the value knowing it is JSON, and
+ # thus decode it. If this fails, some threads will instead see the
+ # raw string ("1"), or raise an exception.
+ assert_equal [1] * threads.size, threads.map(&:value)
+ end
end