如何从 mongodb 中的嵌套文档中查询数据？

Question

我在这个嵌套文档上苦苦挣扎。我尝试阅读该文档并遵循其他 SO 响应以查看它是否对我有用，但我没有得到我正在寻找的结果。我想从一个大的嵌套文档中提取一些信息。

数据

我已将数据上传到 mongo playground。 https://mongoplayground.net/p/7nbLtXMlFMx

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","publishDateIso8601":"2020-09-21T06:52:56-04:00","type":"post"},"children":[{"name":"image","config":{"aspectRatio":0.5625,"attachmentId":2888833,"alt":"","caption":"","crops":[],"height":0,"imageSize":"full","lazyload":true,"lqipSrc":"data: image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7","postId":2888827,"retina":true,"showCaption":false,"sources":[],"sourceTags":[],"src":"","srcset":"","url":"","useBasicImg":false,"usingDataFallback":false,"width":0},"children":[]},{"name":"byline","config":{"link":"https://fortune.com/author/stephen-stapczynski/","name":"Stephen Stapczynski"},"children":[]},{"name":"byline","config":{"link":"https://fortune.com/author/akshat-rathi/","name":"Akshat Rathi"},"children":[]},{"name":"byline","config":{"link":"https://fortune.com/author/bloomberg/","name":"Bloomberg"},"children":[]}]},{"name":"content-item","config":{"themeName":"company_latest_news","timeago":"","isNativoTout":false,"eyebrowSectionLabel":"Retail","eyebrowSectionLink":"https://fortune.com/section/retail/","eyebrowTagLabel":"Food Waste","eyebrowTagLink":"https://fortune.com/tag/food-waste/","title":"Exclusive: Startup Apeel is launching ‘plastic-free’ cucumbers at Walmart to cut back on waste","permalink":"https://fortune.com/2020/09/21/apeel-cucumbers-walmart-plastic-food-waste/","id":2888394,"excerpt":"Apeel’s English cucumbers are coated in a plant-based material that extends shelf life without the need for single-use plastic.","publishDateIso8601":"2020-09-21T06:00:31-04:00","type":"post"},"children":[{"name":"image","config":{"aspectRatio":0.5625,"attachmentId":2888387,"alt":"","caption":"","crops":[],"height":0,"imageSize":"full","lazyload":true,"lqipSrc":"data: image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7","postId":2888394,"retina":true,"showCaption":false,"sources":[],"sourceTags":[],"src":"","srcset":"","url":"","useBasicImg":false,"usingDataFallback":false,"width":0},"children":[]},{"name":"byline","config":{"link":"https://fortune.com/author/beth-kowitt/","name":"Beth Kowitt"},"children":[]}]}]},{"name":"company-latest-videos","config":{"tags":["Walmart"],"title":"Walmart"},"children":[]},{"name":"sidebar","config":{"themeName":"right"},"children":[{"name":"advertising-slot","config":{"align":"center","lazyload":true,"useDynamicChannel":false,"placementName":"RightRailFlex","slotId":"RightRailFlex1","targeting":{"placement_name":"RightRailFlex","index":2}},"children":[]}]}]}]}}

我要提取的是来自children of page 的config，其中名称为company-information 和来自名称company-hero 的description。我阅读了文章和文档，如果文档不是嵌套的，我可以做我想做的事。但是我完全不知道如何提取我正在寻找的那些信息。这是我第一次在 Mongodb 上工作到这种程度。我以前做过一些非常基本的事情。

我试过了

db.collection.find(
    {"page.children.3.children.2.name": {"$eq": "company-information"}}, 
    {"page.children.3.children.2": 1}
) 

但结果为空

输出

大约有 1000 行（？不确定我是否可以称之为行）。我感兴趣的部分是拉动名称为company-information 的page.children[3].children[2]。所以结果应该如下：

"config": {
                "ceo": "C. Douglas McMillon",
                "companyType": "Public",
                "country": "U.S.",
                "employees": "2200000",
                "footnote": "Market value as of Sept. 15, 2020.",
                "headquarters": "Bentonville, Ark.",
                "industry": "General Merchandise",
                "marketValue": "389244",
                "profits": "14881",
                "revenues": "523964",
                "ticker": "WMT",
                "title": "Company information",
                "updated": "9/21/20",
                "website": "https://www.stock.walmart.com"
              }

Answer 1

您可以（几乎！）使用聚合查询做任何事情。在您的情况下，我建议使用$unwind 将列表转换为对象，然后在目标字段上使用$match，$project 减少输出，$replaceRoot 以简化结构，$limit 永远衡量，因为实际上有 2 条记录符合您的条件。

https://mongoplayground.net/p/UsKeqA0aWYK

db.collection.aggregate([
  {
    "$unwind": "$page.children"
  },
  {
    "$unwind": "$page.children.children"
  },
  {
    "$match": {
      "page.children.children.name": "company-information"
    }
  },
  {
    "$project": {
      "_id": 0,
      "page.children.children.config": 1
    }
  },
  {
    "$replaceRoot": {
      "newRoot": "$page.children.children"
    }
  },
  {
    "$limit": 1
  }
])