included (ActiveRecord::ConnectionAdapters::QueryCache)

    # File lib/active_record/connection_adapters/abstract/query_cache.rb, line 5
            def included(base)
              base.class_eval do
                attr_accessor :query_cache_enabled
                alias_method_chain :columns, :query_cache
                alias_method_chain :select_all, :query_cache
              end

              dirties_query_cache base, :insert, :update, :delete
            end