gistfile1.js

        var parent = this;

        var data_context = function(list) {
          return {
              rank_list: function() {
                console.log('rank list', list);
                debugger;
                return list.reactive();
              },
              rank_data_ready: function() {
                console.log('ready', list);
                debugger;
                list.depend();
                if(list.length) {
                  return true;
                }
                return false;
              }
          };
        };

        var rank_buy = data_context(this.rank_list_buy);
        var rank_sell = data_context(this.rank_list_sell);

        return {
          rank_buy: rank_buy,
          rank_sell: rank_sell
        };

        return {
          rank_buy: {

              rank_list: function() {
                return parent.rank_list_buy.reactive();
              },
              rank_data_ready: function() {
                parent.rank_list_buy.depend();
                if(parent.rank_list_buy.length) {
                  return true;
                }
                return false;
              }
          },
          rank_sell: {
              rank_list: function() {
                return parent.rank_list_sell.reactive();
              },
              rank_data_ready: function() {
                parent.rank_list_sell.depend();
                if(parent.rank_list_sell.length) {
                  return true;
                }
                return false;
              }
          },
        }; //return