arangodb AQL 如何修改嵌套数组中对象的值？答案

【问题标题】：arangodb AQL How to modify the value of the object in a nested array?arangodb AQL 如何修改嵌套数组中对象的值？
【发布时间】：2017-10-12 01:39:36
【问题描述】：

我的文档是这样组织的：

{
  "email": "tyler_li@126.com",
  "name": "tyler",
  "address": {
    "street": "Beijing Road",
    "zip": 510000
  },
  "likes": [
    "running",
    {
      "movie": "Star Wars"
    }
  ]
}

我在修改“电影”的值时遇到问题。您能帮我吗，如何使用 AQL 修改值？

谢谢！

【问题讨论】：

标签： arangodb aql

【解决方案1】：

以下查询应该可以。我将解释作为 cmets 放在查询中。我的示例假设文档存在于名为 collection 的集合中：

FOR doc IN collection
  /* any filter condition to find the document(s) in question.
     you should make sure this uses an index if there is a substantial
     number of documents in the collection */
  FILTER doc.name == 'tyler' 

  /* enumerate the old likes and return them as is if they are not
     of type object or do not have a 'movie' attribute. If they are
     objects and have a 'movie' attribute, patch them with a 'movie'
     value of 'whatever' */
  LET newLikes = (
    FOR oldLike IN doc.likes 
      RETURN 
        (TYPENAME(oldLike) == 'object' && HAS(oldLike, 'movie')) ?
            { movie: 'whatever' } :
            oldLike
  ) 

  /* finally update the matching document(s) with the new likes */
  UPDATE doc WITH { likes: newLikes } IN collection

【讨论】：

非常感谢您的详细解答。