{"id":30052,"date":"2023-10-27T18:19:46","date_gmt":"2023-07-09T16:20:47","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/mongodb%e7%9a%84%e8%81%9a%e5%90%88%e7%a4%ba%e4%be%8b%e5%91%bd%e4%bb%a4%e5%92%8cmongoose%ef%bc%83aggregate%ef%bc%88%ef%bc%89%e5%9c%a8node-js%e4%b8%ad%e7%9a%84%e7%94%a8%e6%b3%95\/"},"modified":"2025-08-12T17:17:46","modified_gmt":"2025-08-12T09:17:46","slug":"mongodb%e7%9a%84%e8%81%9a%e5%90%88%e7%a4%ba%e4%be%8b%e5%91%bd%e4%bb%a4%e5%92%8cmongoose%ef%bc%83aggregate%ef%bc%88%ef%bc%89%e5%9c%a8node-js%e4%b8%ad%e7%9a%84%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/mongodb%e7%9a%84%e8%81%9a%e5%90%88%e7%a4%ba%e4%be%8b%e5%91%bd%e4%bb%a4%e5%92%8cmongoose%ef%bc%83aggregate%ef%bc%88%ef%bc%89%e5%9c%a8node-js%e4%b8%ad%e7%9a%84%e7%94%a8%e6%b3%95\/","title":{"rendered":"MongoDB\u7684\u805a\u5408\u793a\u4f8b\u547d\u4ee4\u548cMongoose\uff03Aggregate\uff08\uff09\u5728node.js\u4e2d\u7684\u7528\u6cd5"},"content":{"rendered":"<h1>\u25aa\ufe0f\u4eca\u5929\u7684\u56f0\u60d1<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">MongoDB\u3067\u3001groupby\u3068\u304bdistinct\u3068\u304b\u3069\u3046\u3059\u308b\u306e\uff1f<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u305d\u308c\u3092node.js\u3067\u5b9f\u88c5\u3059\u308b\u5834\u5408\u306f\u3069\u3046\u3059\u308b\u306e\uff1f<\/ul>\n<h1>\u89e3\u51b3\u95ee\u9898<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">MongoDB\u306eaggregate\u3092\u4f7f\u3046\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">node.js\u3067MongoDB\u3092\u4f7f\u3046\u6642\u306f\u3001monngoose\u3092\u4f7f\u3046\u3002<\/ul>\n<h2>\u9996\u5148\u662f\u4e00\u4e2a\u53c2\u8003\u94fe\u63a5\u96c6\u3002\u9605\u8bfb\u5e76\u5b9e\u9645\u7b5b\u9009\u6570\u636e\u540e\uff0c\u4f60\u4f1a\u9010\u6e10\u638c\u63e1\u7a8d\u95e8\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Aggregation \u2014 MongoDB Manual 3.4<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Aggregation Pipeline Operators \u2014 MongoDB Manual 3.4<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Aggregation with the Zip Code Data Set \u2014 MongoDB Manual 3.4<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">MongoDB Aggregation<\/ul>\n<\/li>\n<\/ul>\n<p>MySQL\u306b\u99b4\u67d3\u3093\u3067\u3044\u308b\u4eba\u306f\u3053\u3061\u3089\u3082\u3069\u3046\u3067\u3057\u3087\u3046\u304b\u3002MySQL\u306e\u30af\u30a8\u30ea\u3092Mongo\u306e\u30af\u30a8\u30ea\u306b\u76f4\u3057\u3066\u304f\u308c\u308b\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>Query Mongo: MySQL to MongoDB Query Translator<\/p>\n<h2>\u7528MongoDB\u8fdb\u884c\u7b80\u5355\u7684\u805a\u5408\u64cd\u4f5c\u7684\u793a\u4f8b\u3002<\/p>\n<h2>\u51c6\u5907\u8fdb\u884c\u805a\u5408\u6570\u636e\u7684\u51c6\u5907\u5de5\u4f5c<\/p>\n<ul class=\"post-ul\">\u3061\u306a\u307f\u306b\u3001MongoDB\u3067\u306e\u65e5\u4ed8\u306e\u633f\u5165\u306f\u4ee5\u4e0b\u306e\u901a\u308a<\/ul>\n<pre class=\"post-pre\"><code>db.example.insert({\"date\":new Date(Date.now())});\r\n<\/code><\/pre>\n<ul class=\"post-ul\">monngoose\u306f\u3001collection\u3092\u8907\u6570\u5f62\u3067\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/ul>\n<p>\u7a0d\u540e\u4f1a\u63d0\u5230\uff0c\u5982\u679c\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u521b\u5efaTopic\u6a21\u578b\uff0c\u5219MongoDB\u7684\u76ee\u6807\u5e94\u8be5\u662f\u201ctopic\u201d\uff0c\u4f46\u5b9e\u9645\u4e0a\u662f\u201ctopics\u201d\uff0c\u6240\u4ee5\u8bf7\u5c0f\u5fc3\u907f\u514d\u9677\u9631\u3002<\/p>\n<pre class=\"post-pre\"><code>var TopicModel = mongoose.model('Topic', topicSchema);\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf\u3092insert\u3057\u307e\u3059<\/ul>\n<pre class=\"post-pre\"><code>\r\ndb.topics.insert(\r\n[\r\n   {\r\n      posted_at: new Date(Date.now()),\r\n      posted_by: 'tanaka',\r\n      data: 'hogehoge',\r\n      room:'room_1',\r\n      topic_text:'Todays Weather',\r\n   },\r\n   {\r\n      posted_at: new Date(Date.now()),\r\n      posted_by: 'okamoto',\r\n      data: 'hogehoge',\r\n      room:'room_2',\r\n      topic_text:'Todays Weather',\r\n   },\r\n   {\r\n      posted_at: new Date(Date.now()),\r\n      posted_by: 'tanaka',\r\n      data: 'hogehoge',\r\n      room:'room_2',\r\n      topic_text:'Todays Weather',\r\n   },\r\n   {\r\n      posted_at: new Date(Date.now()),\r\n      posted_by: 'yamamoto',\r\n      data: 'hogehoge',\r\n      room:'room_1',\r\n      topic_text:'New Year',\r\n   },\r\n   {\r\n      posted_at: new Date(Date.now()),\r\n      posted_by: 'tanaka',\r\n      data: 'hogehoge',\r\n      room:'room_1',\r\n      topic_text:'Count Down',\r\n   },\r\n]\r\n)\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c7\u30fc\u30bf\u3092select\u3057\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>pretty\u3092\u3064\u3051\u3066\u3042\u3052\u308b\u3068\u3001\u5206\u304b\u308a\u3084\u3059\u3044JSON\u5f62\u5f0f\u3067\u51fa\u529b\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<p>db.topics.find().pretty()<\/p>\n<h2>\u6267\u884cAggregation<br \/>\n\u805a\u5408\u529f\u80fd\u7c7b\u4f3c\u4e8eUnix\u7684\u7ba1\u9053\u201c|\u201d\u64cd\u4f5c\u7b26\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">count<\/ul>\n<\/li>\n<\/ul>\n<p>posted_by\u6bce\u306e\u6570<\/p>\n<pre class=\"post-pre\"><code>db.topics.aggregate([\r\n{$group : {_id : \"$posted_by\", num : {$sum : 1}}}\r\n])\r\n\r\n\r\n{ \"_id\" : \"yamamoto\", \"num\" : 1 }\r\n{ \"_id\" : \"okamoto\", \"num\" : 1 }\r\n{ \"_id\" : \"tanaka\", \"num\" : 3 }\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">group<\/ul>\n<\/li>\n<\/ul>\n<p>room\u6bce\u306bgroupby<\/p>\n<pre class=\"post-pre\"><code>\r\ndb.topics.aggregate( [ \r\n{ $group : { _id :  { room: \"$room\" },  profile: { $push: \"$$ROOT\" }} } \r\n] ).pretty()\r\n\r\n\r\n\r\n{\r\n    \"_id\" : {\r\n        \"room\" : \"room_2\"\r\n    },\r\n    \"profile\" : [\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16c\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"okamoto\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_2\",\r\n            \"topic_text\" : \"Todays Weather\"\r\n        },\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16d\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"tanaka\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_2\",\r\n            \"topic_text\" : \"Todays Weather\"\r\n        }\r\n    ]\r\n}\r\n{\r\n    \"_id\" : {\r\n        \"room\" : \"room_1\"\r\n    },\r\n    \"profile\" : [\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16b\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"tanaka\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_1\",\r\n            \"topic_text\" : \"Todays Weather\"\r\n        },\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16e\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"yamamoto\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_1\",\r\n            \"topic_text\" : \"New Year\"\r\n        },\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16f\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"tanaka\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_1\",\r\n            \"topic_text\" : \"Count Down\"\r\n        }\r\n    ]\r\n}\r\n\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">match+ group + sort<\/ul>\n<\/li>\n<\/ul>\n<p>room = room_1<br \/>\nposted_at\u306e\u30bd\u30fc\u30c8<br \/>\ntopic_text\u6bce<\/p>\n<pre class=\"post-pre\"><code>db.topics.aggregate( [ \r\n{ $match: { room : \"room_1\"}},\r\n{ $sort: {posted_at:1}},\r\n{ $group : { _id :  { topic_text: \"$topic_text\" },  profile: { $push: \"$$ROOT\" }} } \r\n] ).pretty()\r\n\r\n{\r\n    \"_id\" : {\r\n        \"topic_text\" : \"Count Down\"\r\n    },\r\n    \"profile\" : [\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16f\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"tanaka\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_1\",\r\n            \"topic_text\" : \"Count Down\"\r\n        }\r\n    ]\r\n}\r\n{\r\n    \"_id\" : {\r\n        \"topic_text\" : \"New Year\"\r\n    },\r\n    \"profile\" : [\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16e\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"yamamoto\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_1\",\r\n            \"topic_text\" : \"New Year\"\r\n        }\r\n    ]\r\n}\r\n{\r\n    \"_id\" : {\r\n        \"topic_text\" : \"Todays Weather\"\r\n    },\r\n    \"profile\" : [\r\n        {\r\n            \"_id\" : ObjectId(\"5861f90669e5e0b2eb21f16b\"),\r\n            \"posted_at\" : ISODate(\"2016-12-27T05:15:50.603Z\"),\r\n            \"posted_by\" : \"tanaka\",\r\n            \"data\" : \"hogehoge\",\r\n            \"room\" : \"room_1\",\r\n            \"topic_text\" : \"Todays Weather\"\r\n        }\r\n    ]\r\n}\r\n<\/code><\/pre>\n<h2>\u4f7f\u7528mongoose\u548cnode.js\u8fdb\u884c\u5b9e\u73b0<br \/>\n\u597d\uff0c\u6211\u5011\u5c07\u7528Node.js\u7de8\u5beb\u4e0a\u8ff0\u4f7f\u7528aggregate\u65b9\u6cd5\u57f7\u884c\u7684\u5167\u5bb9\u3002\u6211\u5011\u5c07\u901a\u904e\u904b\u884cnpm install\u4f86\u5b89\u88dd\u4e26\u4f7f\u7528mongoose\u3002<\/p>\n<ul class=\"post-ul\">Mongoose API v4.7.5<\/ul>\n<pre class=\"post-pre\"><code>\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">mongoose<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mongoose<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">Schema<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">mongoose<\/span><span class=\"p\">.<\/span><span class=\"nx\">Schema<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/Database connection<\/span>\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">uristring<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mongodb:\/\/localhost\/jp<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">mongoOptions<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span> <span class=\"p\">};<\/span>\r\n\r\n<span class=\"nx\">mongoose<\/span><span class=\"p\">.<\/span><span class=\"nx\">connect<\/span><span class=\"p\">(<\/span><span class=\"nx\">uristring<\/span><span class=\"p\">,<\/span> <span class=\"nx\">mongoOptions<\/span><span class=\"p\">,<\/span> <span class=\"kd\">function<\/span> <span class=\"p\">(<\/span><span class=\"nx\">err<\/span><span class=\"p\">,<\/span> <span class=\"nx\">res<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nx\">err<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">Error when connecting to: <\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">uristring<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">. <\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">err<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">else<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">Successfully connected to: <\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">uristring<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/Schemas:<\/span>\r\n\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">topicSchema<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">Schema<\/span><span class=\"p\">({<\/span>\r\n    <span class=\"na\">posted_by<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"nb\">String<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">default<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"na\">posted_at<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Date<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">default<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Date<\/span><span class=\"p\">.<\/span><span class=\"nx\">now<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"na\">data<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"nb\">String<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">default<\/span><span class=\"p\">:<\/span> <span class=\"nx\">JSON<\/span><span class=\"p\">.<\/span><span class=\"nx\">stringify<\/span><span class=\"p\">({})<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"na\">room<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"nb\">String<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">default<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"na\">topic_text<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"nb\">String<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">default<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/Define Models<\/span>\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">TopicModel<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">mongoose<\/span><span class=\"p\">.<\/span><span class=\"nx\">model<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">Topic<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"nx\">topicSchema<\/span><span class=\"p\">);<\/span>\r\n\r\n\r\n<span class=\"nx\">getTopicProfile<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">room_1<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"kd\">function<\/span><span class=\"p\">(<\/span><span class=\"nx\">err<\/span><span class=\"p\">,<\/span> <span class=\"nx\">data<\/span><span class=\"p\">){<\/span>\r\n    <span class=\"k\">if<\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"nx\">err<\/span><span class=\"p\">){<\/span>\r\n        <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">JSON<\/span><span class=\"p\">.<\/span><span class=\"nx\">stringify<\/span><span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">));<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/Aggregation function<\/span>\r\n<span class=\"kd\">function<\/span> <span class=\"nx\">getTopicProfile<\/span><span class=\"p\">(<\/span><span class=\"nx\">room_name<\/span><span class=\"p\">,<\/span> <span class=\"nx\">callback<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">TopicModel<\/span><span class=\"p\">.<\/span><span class=\"nx\">aggregate<\/span><span class=\"p\">([<\/span>\r\n        <span class=\"p\">{<\/span> <span class=\"na\">$match<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"na\">room<\/span><span class=\"p\">:<\/span> <span class=\"nx\">room_name<\/span>\r\n        <span class=\"p\">}},<\/span>\r\n        <span class=\"p\">{<\/span> <span class=\"na\">$sort<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span><span class=\"na\">posted_at<\/span><span class=\"p\">:<\/span><span class=\"mi\">1<\/span><span class=\"p\">}},<\/span>\r\n        <span class=\"p\">{<\/span> <span class=\"na\">$group<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"na\">_id<\/span> <span class=\"p\">:<\/span>  <span class=\"p\">{<\/span>  <span class=\"na\">topic_text<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">$topic_text<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">},<\/span>\r\n            <span class=\"na\">profile<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">$push<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">$$ROOT<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">}<\/span>\r\n            <span class=\"p\">}<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">],<\/span> <span class=\"kd\">function<\/span> <span class=\"p\">(<\/span><span class=\"nx\">err<\/span><span class=\"p\">,<\/span> <span class=\"nx\">result<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nx\">err<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">err<\/span><span class=\"p\">);<\/span>\r\n            <span class=\"k\">return<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">JSON<\/span><span class=\"p\">.<\/span><span class=\"nx\">stringify<\/span><span class=\"p\">(<\/span><span class=\"nx\">result<\/span><span class=\"p\">));<\/span>\r\n    <span class=\"p\">});<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30fc\u30c9\u306f\u3053\u3061\u3089\u3092\u53c2\u8003\u306b\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u305f\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>Aggregate data from MongoDB with Node.js and mongoose<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u25aa\ufe0f\u4eca\u5929\u7684\u56f0\u60d1 MongoDB\u3067\u3001groupby\u3068\u304bdistinct\u3068\u304b\u3069\u3046\u3059\u308b\u306e\uff1f &nbsp; \u305d\u308c\u3092no [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30052","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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