code: function _counter() {
      var counter = this.single.counter;
      var toUpdate = {};
      toUpdate[counter.column] = this.client.raw(this.formatter.wrap(counter.column) + ' ' + (counter.symbol || '+') + ' ' + counter.amount);
      this.single.update = toUpdate;
      return this.update();
    }
docs: Compile the "counter".