如何使用 sequelize.js 从关联模型中加载属性
我正在用两个模型简化当前项目.
自助服务终端模式
module.exports = function(sequelize, DataTypes) {
return sequelize.define('kiosk', {
id: {
type: DataTypes.BIGINT,
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: DataTypes.STRING(150),
allowNull: false
},
}, {
tableName: 'kiosk',
timestamps: false,
underscored: true
});
};
收据模型
module.exports = function(sequelize, DataTypes) {
return sequelize.define('receipt', {
id: {
type: DataTypes.STRING(255),
allowNull: false,
primaryKey: true
},
kiosk_id: {
type: DataTypes.BIGINT,
allowNull: false,
references: {
model: 'kiosk',
key: 'id'
}
},
customer_id: {
type: DataTypes.BIGINT,
allowNull: false,
references: {
model: 'customer_type',
key: 'id'
}
},
total: {
type: DataTypes.DECIMAL,
allowNull: false
},
}, {
tableName: 'receipt',
timestamps: false,
underscored: true
});
};
模型被缩小以简化问题
我的协会
models.receipt.belongsTo(models.kiosk, {
as: 'kiosk'
});
models.kiosk.hasMany(models.receipt, {
as: 'receipt'
});
最终查询:
const Kiosk = require('../models').kiosk;
const R = ReceiptModel = require('../models').receipt;
try {
let receiptModels = await ReceiptModel.findAll({
raw: true,
attributes: [['kiosk.name', 'KioskName']],
include: [{
model: Kiosk,
required: false,
as: 'kiosk',
attributes: []
}],
});
return res.json(receiptModels);
}catch(err){
// I am getting Error
return res.status(500).send({ msg: err.message });
}
我的期望:
receiptModels = [{
KioskName: 'MyKioskName#1'
},{
KioskName: 'MyKioskName#2'
},{
KioskName: 'MyKioskName#3'
},
];
但是,我收到以下错误:
But, I am getting the following errors:
{
"name": "SequelizeDatabaseError",
"parent": {
"code": "ER_BAD_FIELD_ERROR",
"errno": 1054,
"sqlState": "42S22",
"sqlMessage": "Unknown column 'kiosk.name' in 'field list'",
"sql": "SELECT `kiosk.name` AS `KioskName` FROM `receipt` AS `receipt` LEFT OUTER JOIN `kiosk` AS `kiosk` ON `receipt`.`kiosk_id` = `kiosk`.`id` WHERE `receipt`.`created_at` >= '2020-01-20 05:00:00' LIMIT 2;"
},
"original": {
"code": "ER_BAD_FIELD_ERROR",
"errno": 1054,
"sqlState": "42S22",
"sqlMessage": "Unknown column 'kiosk.name' in 'field list'",
"sql": "SELECT `kiosk.name` AS `KioskName` FROM `receipt` AS `receipt` LEFT OUTER JOIN `kiosk` AS `kiosk` ON `receipt`.`kiosk_id` = `kiosk`.`id` WHERE `receipt`.`created_at` >= '2020-01-20 05:00:00' LIMIT 2;"
},
"sql": "SELECT `kiosk.name` AS `KioskName` FROM `receipt` AS `receipt` LEFT OUTER JOIN `kiosk` AS `kiosk` ON `receipt`.`kiosk_id` = `kiosk`.`id` WHERE `receipt`.`created_at` >= '2020-01-20 05:00:00' LIMIT 2;"
}
注意:我的帖子与这篇文章类似,尽管它(帖子)不能解决我的问题.这是紧急情况,根据 StackOverflow 政策,我们不应该在关闭的问题上发布.从 sequelize.js 中的关联模型中加载属性
NB: My post is similar with this one though it (the post) doesn't fix my problem. And this an emergency and according to StackOverflow policy we shouldn't post on a close issue. Load attributes from associated model in sequelize.js
推荐答案
我使用 sequelize.col()
函数让它工作.
I have it working by using sequelize.col()
function.
以下是最终/有效的查询代码:
Following is the final/working query code:
try {
let receiptModels = await ReceiptModel.findAll({
raw: true,
attributes: [[Sequelize.col('kiosk.name'), 'Kiosk']],
include: [{
model: Kiosk,
required: false,
as: 'kiosk',
attributes: []
}],
});
return res.json(receiptModels);
}catch(err){
return res.status(500).send({ msg: err.message });
}
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