javascript - Sequelize.js 查询通过关系获取总数

Question

我正在使用 sequelize 通过关系获取总计数。我需要通过一个 customerId 来获取它，它位于通过数据透视表连接的父表中。普通查询看起来像这样:

SELECT count(p.*) FROM parcels as p
LEFT JOIN orders_parcels as op ON op."parcelId" = p.id
LEFT JOIN orders as o ON op."orderId" = o.id
WHERE o."customerId"=1

这很好用。但不确定如何获取 sequelize 查询。

Parcel.findAndCountAll();

编辑:OrderParcel

var OrderParcel = service.sequelize.define('OrderParcel', {

    id: {
        type: Sequelize.INTEGER,
        primaryKey: true,
        autoIncrement: true
    }
}, {
    tableName: 'orders_parcels',
    freezeTableName: true,
    paranoid: true
});

module.exports = OrderParcel;

var Order = require('./Order');

OrderParcel.belongsTo(Order, {
    as: 'Order',
    foreignKey: 'orderId'
});

var Parcel = require('../parcel/Parcel');

OrderParcel.belongsTo(Parcel, {
    as: 'Parcel',
    foreignKey: 'parcelId'
});

Answer 1

一种方法是使用sequelize.query:

As there are often use cases in which it is just easier to execute raw / already prepared SQL queries, you can utilize the function sequelize.query.

var query = "SELECT count(p.*) FROM parcels as p" +
" LEFT JOIN orders_parcels as op ON op."parcelId" = p.id" +
" LEFT JOIN orders as o ON op."orderId" = o.id" +
" WHERE o.customerId=1;";

sequelize.query(query, { type: sequelize.QueryTypes.SELECT}).success(function(count){
    console.log(count); // It's show the result of query          
    res.end();
}).catch(function(error){            
    res.send('server-error', {error: error});
});

Raw Queries docs