Method getCacheKey

lib/mapping/model-batch-item.js:62–64

* Gets the cache key for this item. * @abstract * @param {Array} docKeys * @returns {Iterator}

(docKeys)

   * @returns {Iterator}
   */
  getCacheKey(docKeys) {
    throw new Error('getCacheKey must be implemented');
  }

  /**
   * Gets the Promise to create the queries.