1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 3c9510e469..c1d846f58d 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -506,6 +506,10 @@ module ActiveRecord
         @connection
       end
 
+      def default_uniqueness_comparison(attribute, value) # :nodoc:
+        case_sensitive_comparison(attribute, value)
+      end
+
       def case_sensitive_comparison(attribute, value) # :nodoc:
         attribute.eq(value)
       end