code: function (store, type/*, record*/) {
      var key, counters;
      key = dasherize(this._parseModelOrType(store, type).typeKey);
      counters = this.get('_generatedCounterId');
      if (!counters[key]) {
        counters[key] = 1;
      }
      return 'fixture-' + key + '-' + (counters[key]++);
    }
docs: Generates an ID for a record
  
  @method generateId
  @param {DS.Store} store
  @param {subclass of DS.Model|string} type
  @param {DS.Model} record
  @return {String} id