本文介绍了MongoDb 聚合 $match 错误:“参数必须是聚合管道运算符";的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我可以使用 aggregation 获取网站的所有统计信息,但我希望为某个用户提供,例如 $where.
I can get all stats of the site with aggregation but I want to it for a certain user, like $where.
所有统计数据:
games.aggregate([{ $group: { _id: '$id', game_total: { $sum: '$game_amount'}, game_total_profit: { $sum: '$game_profit'}} }]).exec(function ( e, d ) { console.log( d ) })当我尝试使用 $match 运算符时,出现错误:
When I try to use $match operator, I'm getting error :
games.aggregate([{ $match: { '$game_user_id' : '12345789' }, $group: { _id: '$id', game_total: { $sum: '$game_amount'}, game_total_profit: { $sum: '$game_profit'}} }]).exec(function ( e, d ) { console.log( d ) }) Arguments must be aggregate pipeline operators我错过了什么?
推荐答案Pipeline stage 是数组中单独的 BSON 文档:
Pipeline stages are separate BSON documents in the array:
games.aggregate([ { $match: { 'game_user_id' : '12345789' } }, { $group: { _id: '$id', game_total: { $sum: '$game_amount'}, game_total_profit: { $sum: '$game_profit'}} }} ]).exec(function ( e, d ) { console.log( d ) });因此 JavaScript 中的 Array 或 [] 括号表示法意味着它期望提供一个列表".这意味着一个文档"列表,它们通常以带有 {} 大括号的 JSON 表示法指定.
So the Array or [] bracket notation in JavaScript means it expects a "list" to be provided. This means a list of "documents" which are generally specified in JSON notation with {} braces.
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MongoDb 聚合 $match 错误:“参数必须是聚合管道运算符";
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