本文实例讲述了nodejs+mongodb aggregate级联查询操作。分享给大家供大家参考,具体如下:
最近完成了一个nodejs+mongoose的项目,碰到了mongodb的级联查询操作。情形是实现一个排行榜,查看某个公司(organization)下属客户中发表有效文ruan章wen最多的前十人。
Account表:公司的信息单独存在一个account表里。
var AccountSchema = new Schema({
loginname: {type: String},
password: {type: String},
/**
* 联系方式
*/
//账户公司名
comName: {type: String},
//地址
address: {type: String},
//公司介绍
intro: {type: String}
});
mongoose.model('Account', AccountSchema);
Cusomer表:公司的客户群。
var CustomerSchema = new Schema({
/**
* 基本信息
*/
//密码
password: {type: String},
//归属于哪个Account
belongToAccount: {type: ObjectId, ref: 'Account'},
//手机号,登录用
mobile: {type: String},
//真实姓名
realname: {type: String}
});
CustomerSchema.index({belongToAccount: 1, mobile: 1}, {unique: true});
mongoose.model('Customer', CustomerSchema);
article表
var articleSchema= new Schema({
belongToAccount: {type: ObjectId, ref: 'Account'},
title: {type: String},
text: {type: String},
createTime: {type: Date, default: Date.now},
author: {type: ObjectId, ref: 'Customer'},
//0,待确认,1 有效 ,-1 无效
status: {type: Number, default: 0}
});
articleSchema.index({belongToAccount: 1, createTime:-1,author: 1}, {unique: false});
mongoose.model('article', articleSchema);
这里要做的就是,由accountId→aggregate整理软文并排序→级联author找到作者的姓名及其他信息。
代码如下:
exports.getRankList = function (accountid, callback) {
AticleModel.aggregate(
{$match: {belongToAccount: mongoose.Types.ObjectId(accountid), status: 1}},
{$group: {_id: {customerId: "$author"}, number: {$sum: 1}}},
{$sort: {number: -1}}).limit(10).exec(function (err, aggregateResult) {
if(err){
callback(err);
return;
}
var ep = new EventProxy();
ep.after('got_customer', aggregateResult.length, function (customerList) {
callback(null, customerList);
});
aggregateResult.forEach(function (item) {
Customer.findOne({_id: item._id.customerId}, ep.done(function (customer) {
item.customerName = customer.realname;
item.customerMobile=cusomer.mobile;
// do someting
ep.emit('got_customer', item);
}));
})
});
};
返回的结果格式(这里仅有两条记录,实际为前十):
[ { _id: { customerId: 559a5b6f51a446602032fs21 }, number: 5,
customerName: 'test2',
mobile:22 } ,
{ _id: { customerId: 559a5b6f51a446602041ee6f }, number: 1,
customerName: 'test1',
mobile: 11 } ]
希望本文所述对大家nodejs程序设计有所帮助。