lib/rom/plugins/relation/sql/auto_combine.rb in rom-sql-1.0.0.rc1 vs lib/rom/plugins/relation/sql/auto_combine.rb in rom-sql-1.0.0.rc2

@@ -44,10 +44,13 @@
               target.preload(source_key, target_key)
             end
 
             # @api private
             def preload(source_key, target_key, source)
-              where(target_key => source.pluck(source_key.to_sym))
+              target_pks = source.pluck(source_key.to_sym).uniq
+              target_pks.uniq!
+
+              where(target_key => target_pks)
             end
           end
         end
       end
     end