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我有很多账号,每个账号都有一名员工。我想找到每个员工的账户数量。我如何使用猫鼬聚合(mongodb)来完成这项任务。我熟悉猫鼬的其他功能,并能用以下代码实现:如何在猫鼬中进行汇总和分组
exports.accountsOfEachEmployee = function(req, res) {
Account.find({active:true}).exec(function(err, accounts){
if (err || !accounts) res.status(400).send({
message: 'could not retrieve accounts from database'
});
var accountsOfEachEmployee = {};
for (var i = 0; i < accounts.length; i++) {
if(accountsOfEachEmployee[order[i].employee]) {
accountsOfEachEmployee[order[i].employee] = 1;
} else {
accountsOfEachEmployee[order[i].employee]++;
}
}
res.json(accountsOfEachEmployee);
});
};
正在使用聚合更快吗?分组和聚合如何在猫鼬中工作(mongodb)。以下是我的账户模式
var AccountSchema = new Schema({
active: {
type : Boolean,
default: false
},
employee: {
type: Schema.ObjectId,
ref: 'Employee'
},
});