使用Node.js通过ID从DocumentDB读取文档失败 [英] Read document from DocumentDB by ID using Node.js fails

问题描述

我正在尝试使用文档ID从DocumentDB读取单个文档。该集合有四个字段， author 是分区键。

I'm trying to read a single document from DocumentDB by using the document ID. The collection has four fields, author being the partition key.

{
  "id": string,
  "author": string,
  "title": string,
  "year": int
}

我有两个函数用于读取存储在DocumentDB中的记录。 queryCollectionByBookId 按文档ID读取单个文档， queryCollectionGetBooks 返回集合中的所有文档。

I have two functions for reading the records stored into DocumentDB. queryCollectionByBookId reads a single document by document id and queryCollectionGetBooks returns all the documents in the collection.

var dbutils = {
    queryCollectionByBookId: function(client, documentUrl) {
        return new Promise((resolve, reject) => {
            client.readDocument(documentUrl, function(err, doc) {
                if (err) {
                    reject(err);
                } else {
                    resolve(doc);
                }
            });
        });
    },
    queryCollectionGetBooks: function(client, collectionUrl) {
        return new Promise((resolve, reject) => {
            client.readDocuments(collectionUrl).toArray((err, results) => {
                if (err)
                    reject(err);
                else {
                    resolve(results);
                }
            });
        });
    }
};

queryCollectionGetBooks 函数工作正常，但 queryCollectionByBookId 返回以下错误消息。

queryCollectionGetBooks function works fine, but queryCollectionByBookId returns the error message below.

{错误：[提供的分区键在x-ms-partitionkey标头中，组件的数量少于集合中定义的组件。]}

是否有其他人看到此错误消息，发现了如何解决它？

Has anyone else seen this error message and found out how to resolve it?

推荐答案

这是对node.js客户端文档的疏忽，但你必须添加一个 options.partitionKey 属性到 readDocument（链接，选项，回调）调用中的可选第二个参数。

It's an oversight in the documentation for the node.js client, but you have to add an options.partitionKey property to the optional second parameter in your readDocument(link, options, callback) call.

这也是文档的疏忽，但我认为partitionKey需要是一个包含单个元素的数组（例如 {options：{partitionKey：[myKey ]}} [更新：我被告知它现在可以使用单个分区键值，但我自己没有确认。]

It's also an oversight in the docs but I think partitionKey needs to be an array with a single element (e.g. {options: {partitionKey: ["myKey"]}} [UPDATE: I'm told that it will now work with a single partition key value but I haven't confirmed it myself.]

或者，您可以将 options.enableCrossPartitionQuery 属性设置为 true ，但效率较低。

Alternatively, you can set options.enableCrossPartitionQuery property to true but that is less efficient.

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