Javascript 使用Sequelize计算详细记录的总和和计数
使用Sequelize 4.1.0,我希望生成与此PostgreSQL 9.6.3查询相同的结果:Javascript 使用Sequelize计算详细记录的总和和计数,javascript,postgresql,sequelize.js,Javascript,Postgresql,Sequelize.js,使用Sequelize 4.1.0,我希望生成与此PostgreSQL 9.6.3查询相同的结果: SELECT "user"._id, "user"."lastName", "user"."firstName", "user".email, COALESCE(purchase.purchases, 0::bigint) - COALESCE(attendance.attendances, 0::bigint) AS balance FROM "Users" "user"
SELECT
"user"._id,
"user"."lastName",
"user"."firstName",
"user".email,
COALESCE(purchase.purchases, 0::bigint) - COALESCE(attendance.attendances, 0::bigint) AS balance
FROM "Users" "user"
LEFT OUTER JOIN
(SELECT "Purchases"."UserId", SUM("Purchases".quantity) AS purchases
FROM "Purchases"
GROUP BY "Purchases"."UserId") purchase ON "user"._id = purchase."UserId"
LEFT OUTER JOIN
(SELECT "Attendances"."UserId", COUNT("Attendances"._id) AS attendances
FROM "Attendances"
GROUP BY "Attendances"."UserId") attendance ON "user"._id = attendance."UserId"
WHERE "user"."firstName" ILIKE 'Smith%' OR "user"."lastName" ILIKE 'Smith%' OR "user"."email" ILIKE 'Smith%';
我的模型(源代码:)是使用Sequelize 4.0.0定义的,如下所示
import config from '../config/environment'; // source: https://github.com/nstuyvesant/shy/blob/master/server/config/environment/index.js
import Sequelize from 'sequelize';
let db = {
Sequelize,
sequelize: new Sequelize(config.sequelize.uri, config.sequelize.options)
};
// Imported model definitions
db.User = db.sequelize.import('../api/user/user.model'); // source: https://github.com/nstuyvesant/shy/blob/master/server/api/user/user.model.js
db.Purchase = db.sequelize.import('../api/user/purchase.model'); // source: https://github.com/nstuyvesant/shy/blob/master/server/api/user/purchase.model.js
db.Attendance = db.sequelize.import('../api/user/attendance.model'); // source: https://github.com/nstuyvesant/shy/blob/master/server/api/user/attendance.model.js
// Associations
db.Purchase.belongsTo(db.User);
db.Attendance.belongsTo(db.User);
db.User.hasMany(db.Purchase);
db.User.hasMany(db.Attendance);
module.exports = db;
在我的用户API控制器(源:)中,我使用
import { User, Attendance, Purchase } from '../../sqldb';
import sequelize from 'sequelize';
export function index(req, res) {
let startsWith = `${req.query.filter}%`;
return User.findAll({
where: {
$or: [
{ firstName: { $iLike: startsWith } },
{ lastName: { $iLike: startsWith } },
{ email: { $iLike: startsWith } }
]
},
attributes: ['_id', 'lastName', 'firstName', 'email', [sequelize.literal('COALESCE(SUM(purchase.quantity), 0) - COALESCE(COUNT(attendance.id), 0)'), 'balance']],
include: [{model: Purchase, attributes: ['quantity']}, {model: Attendance, attributes: ['_id']}],
group: ['User._id', 'lastName', 'firstName', 'email', 'Purchases._id', 'Attendances._id']
})
.then(users => res.status(200).json(users))
.catch(handleError(res));
}
这是它生成的查询:
SELECT
"User"."_id", "User"."lastName", "User"."firstName", "User"."email", COALESCE(SUM("Purchases"."quantity"), 0) - COALESCE(COUNT("Attendances"."_id"), 0) AS "balance", "Purchases"."_id" AS "Purchases._id", "Purchases"."quantity" AS "Purchases.quantity", "Attendances"."_id" AS "Attendances._id"
FROM "Users" AS "User"
LEFT OUTER JOIN "Purchases" AS "Purchases" ON "User"."_id" = "Purchases"."UserId"
LEFT OUTER JOIN "Attendances" AS "Attendances" ON "User"."_id" = "Attendances"."UserId"
WHERE ("User"."firstName" ILIKE 'Stuyvesant%' OR "User"."lastName" ILIKE 'Stuyvesant%' OR "User"."email" ILIKE 'Stuyvesant%')
GROUP BY "User"."_id", "lastName", "firstName", "email", "Purchases"."_id", "Attendances"."_id";
关于我可能做错了什么有什么想法吗?有一种方法可以生成具有差异结构但结果相同的查询。假设定义了所有模型及其关联,查询将如下所示
User.findAll({
attributes: ['id', 'lastName', 'firstName', 'email', [sequelize.literal('COALESCE(SUM(purchase.quantity), 0) - COALESCE(COUNT(attendance.id), 0)'), 'balance']],
include: [{model: Purchase, attributes: 'quantity'}, {model: Attendance, attributes: 'id'}],
group: ['id', 'lastName', 'firstName', 'email']
})
谢谢你的建议!我已经更新了我的帖子,以显示更多的细节以及我收到的错误。关于我可能在哪里错误地执行了您的建议,您有什么想法吗?更改为
include:[{model:Purchase,attributes:['quantity']},{model:attributes,attributes:['''u id']}],
我没有将属性作为arrayThanks传递-将include.attributes放入数组有助于克服错误。似乎生成的查询正在生成笛卡尔积,这就是为什么我对生成求和和和计数的查询进行左外部联接。你认为我会在不使用原始查询的情况下超越Sequelize的极限吗?