如何从 mongodb 中的嵌套文档中查询数据？
How to query data from nested document in mongodb?
我在处理这个嵌套文档时遇到了太多麻烦。我尝试阅读该文档并遵循其他 SO 回复以查看它是否适合我，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 游乐场。 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 children of page 中的 config，其中名称是 company-information，description 来自名称 company-hero。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。但是我完全不知道如何提取我正在寻找的那些信息。这是我第一次为 Mongodb 工作到这种程度。我以前做过一些很基础的东西。
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取名称为 company-information 的 page.children[3].children[2]。所以结果应该是这样的：
"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"
}
您可以（几乎！）使用聚合查询做任何事情。在你的情况下，我建议使用 $unwind 将列表转换为对象，然后在你的目标字段上使用 $match，$project 到 trim 输出，$replaceRoot 以简化结构，并 $limit 作为良好的衡量标准，因为实际上有 2 条记录符合您的条件。
https://mongoplayground.net/p/UsKeqA0aWYK
db.collection.aggregate([
{
"$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
}
])
我在处理这个嵌套文档时遇到了太多麻烦。我尝试阅读该文档并遵循其他 SO 回复以查看它是否适合我，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 游乐场。 https://mongoplayground.net/p/7nbLtXMlFMx
{"_id":{"$oid":"5f7f29259ac5883ec5eed1ec"},"name":"Walmart","page":{"name":"body","config":{},"children":[{"name":"company-title","config":{"title":"Walmart","rank":"1","franchiseTitle":"Fortune 500","franchisePermalink":"https://fortune.com/fortune500/2020/","parentPermalink":"https://fortune.com/company/walmart/"},"children":[]},{"name":"company-single-pagination","config":{"prevName":"","prevLink":"","prevRank":"","nextName":"Amazon.com","nextLink":"https://fortune.com/company/amazon-com/fortune500/","nextRank":2,"hideRanking":false,"rank":"1","franchiseTitle":"Fortune 500"},"children":[]},{"name":"company-hero","config":{"description":"After years of investment in its technology and stores, Walmart has indisputably emerged as a strong No. 2 to Amazon in U.S. e-commerce, with sales up 37% last year. But as the initial weeks of the novel coronavirus pandemic have shown, Walmart’s 4,600 U.S. stores have proved to be an effective weapon by allowing curbside pickup for online orders at a time shoppers want to limit time in stores—but still want their orders quickly. That sentiment is not likely to change anytime soon. Walmart Inc.’s Sam’s Club is finding renewed energy, too. Walmart is benefiting from focusing on select overseas markets, such as India and China, rather than competing everywhere."},"children":[{"name":"brightcove-video","config":{"accountId":"2111767321001","disableAds":false,"disableAutoplay":false,"disableContinuousPlay":false,"disableViewplay":false,"isLeadVideo":false,"loop":false,"playerId":"HDNR3TkSj","stickyPlayerOff":false,"silentlyAutoplay":true,"videoId":{"$numberLong":"6156999393001"},"section":""},"children":[]}]},{"name":"company-about-wrapper","config":{},"children":[{"name":"company-additional-media","config":{},"children":[]},{"name":"advertising-slot","config":{"align":"center","lazyload":true,"useDynamicChannel":true,"placementName":"InStream","slotId":"InStream0","targeting":{"placement_name":"InStream","index":1}},"children":[]},{"name":"company-information","config":{"title":"Company information","country":"U.S.","headquarters":"Bentonville, Ark.","industry":"General Merchandise","ceo":"C. Douglas McMillon","website":"https://www.stock.walmart.com","companyType":"Public","ticker":"WMT","revenues":"523964","profits":"14881","marketValue":"389244","employees":"2200000","updated":"9/21/20","footnote":"Market value as of Sept. 15, 2020."},"children":[]},{"name":"advertising-slot","config":{"align":"center","lazyload":true,"useDynamicChannel":true,"placementName":"InStream","slotId":"InStream1","targeting":{"placement_name":"InStream","index":2}},"children":[]},{"name":"company-information","config":{"title":"Company information","country":"U.S.","headquarters":"Bentonville, Ark.","industry":"General Merchandise","ceo":"C. Douglas McMillon","website":"https://www.stock.walmart.com","companyType":"Public","ticker":"WMT","revenues":"523964","profits":"14881","marketValue":"389244","employees":"2200000","updated":"9/21/20","footnote":"Market value as of Sept. 15, 2020."},"children":[]},{"name":"company-table-wrapper","config":{},"children":[{"name":"company-data-table","config":{"title":"Key Financials (Last Fiscal Year)","tableIndex":0,"table":{"franchiseId":2814606,"title":"Key Financials (Last Fiscal Year)","rows":[{"value":"Revenues ($M)","pctChange":"Revenue Percent Change"},{"value":"Profits ($M)","pctChange":"Profits Percent Change"},{"value":"Assets ($M)"},{"value":"Total Stockholder Equity ($M)"}],"showValue":"show_value","valueHeader":"$ millions","showPctChange":"show_pct_change","pctChangeHeader":"% change"},"updated":"","data":[{"key":"f500_revenues","value":"523964","fieldMeta":{"franchiseId":2814606,"title":"Revenues ($M)","altTitle":"Revenues ($M)","description":"Companies are ranked by 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millions","showChange":true},"children":[]},{"name":"company-data-table","config":{"title":"Profit Ratios","tableIndex":1,"table":{"franchiseId":2814606,"title":"Profit Ratios","rows":[{"value":"Profit as % of Revenues"},{"value":"Profits as % of Assets"},{"value":"Profits as % of Stockholder Equity"}],"showValue":"show_value","pctChangeHeader":"% change"},"updated":"","data":[{"key":"prftpctsls","value":"2.8","fieldMeta":{"franchiseId":2814606,"title":"Profit as % of Revenues","type":"Percent","decimals":"1","saveIn":"post_meta","importField":"prftpctsls"}},{"key":"prftpctasts","value":"6.3","fieldMeta":{"franchiseId":2814606,"title":"Profits as % of Assets","type":"Percent","decimals":"1","saveIn":"post_meta","importField":"prftpctasts"}},{"key":"prftpctseqty","value":"19.9","fieldMeta":{"franchiseId":2814606,"title":"Profits as % of Stockholder 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我要提取的是 children of page 中的 config，其中名称是 company-information，description 来自名称 company-hero。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。但是我完全不知道如何提取我正在寻找的那些信息。这是我第一次为 Mongodb 工作到这种程度。我以前做过一些很基础的东西。
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取名称为 company-information 的 page.children[3].children[2]。所以结果应该是这样的：
"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"
}
您可以（几乎！）使用聚合查询做任何事情。在你的情况下，我建议使用 $unwind 将列表转换为对象，然后在你的目标字段上使用 $match，$project 到 trim 输出，$replaceRoot 以简化结构，并 $limit 作为良好的衡量标准，因为实际上有 2 条记录符合您的条件。
https://mongoplayground.net/p/UsKeqA0aWYK
db.collection.aggregate([
{
"$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
}
])