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-rw-r--r--activerecord/lib/active_record/validations/uniqueness.rb6
1 files changed, 6 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index 76110b73e4..a96796f9ff 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -15,6 +15,12 @@ module ActiveRecord
def validate_each(record, attribute, value)
finder_class = find_finder_class_for(record)
+ coder = record.class.serialized_attributes[attribute.to_s]
+
+ if value && coder
+ value = coder.dump value
+ end
+
sql, params = mount_sql_and_params(finder_class, record.class.quoted_table_name, attribute, value)
relation = finder_class.unscoped.where(sql, *params)