code: function cacheQuery () {
      // debug
      debug('view:id:collection:get', this.idCacheKey, this.ids)
      // attempt to get from cache
      return this.cache.redis.getAsync(this.idCacheKey)
      // check result
      .then(cached => this.cacheQueryResult(cached))
  }
docs: @function cacheQuery
  
  @returns {Promise}