stop creating intermediate AR objects, just construct AR objects from a list of hashes

Author: tenderlove

activerecord/lib/active_record/relation/finder_methods.rb

@@ -188,7 +188,8 @@ def exists?(id = nil)
     def find_with_associations
       including = (@eager_load_values + @includes_values).uniq
       join_dependency = ActiveRecord::Associations::ClassMethods::JoinDependency.new(@klass, including, [])
-      rows = construct_relation_for_association_find(join_dependency).to_a
+      relation = construct_relation_for_association_find(join_dependency)
+      rows = connection.exec_query(relation.to_sql, 'SQL', relation.bind_values)
       join_dependency.instantiate(rows)
     rescue ThrowResult
       []