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mysql - sequelize 外键返回为“Null”

问题描述

我已经使用 sequelize 在我的项目中添加了外键。User 是父表，profile_personals 是子表。当我发布某些内容时，外键显示为 NULL。我正在尝试创建它，因此当我通过邮递员发布某些内容时，它可以自动获取用户 ID。

在此处输入图像描述

db.js 文件

const db = {}; 
db.sequelize = sequelize;
db.Sequelize = Sequelize;

// Models
db.Users = require('../model/User.js')(sequelize, Sequelize);
db.Personal = require('../model/profile_personal.js')(sequelize, Sequelize);


// Foreign Key Connections
db.Personal.belongsTo(db.Users, {foreignKey: 'fk_user_id', targetKey: 'user_id'});
db.Users.hasOne(db.Personal, {foreignKey: 'fk_user_id', targetKey: 'user_id'});

User.js 模型

    module.exports = (sequelize, Sequelize) => {
    const Users = sequelize.define('users', {
        user_id: {
            type: Sequelize.INTEGER,
            primaryKey: true,
            autoIncrement: true
        },
        email: {
            type: Sequelize.STRING
        },
        password: {
            type: Sequelize.STRING
        }
    },
    {
        timestamps: false
    });

    return Users;
}

profile_personals.js 模型

     module.exports = (sequelize, Sequelize) => {
    const Personal = sequelize.define('profile_personals', {
        ID: {
            type: Sequelize.INTEGER,
            primaryKey: true,
            autoIncrement: true
        },
        biography: {
            type: Sequelize.STRING
        }
    },
    {
        timestamps: false
    });

    return Personal;
}

Profile_personals.js 路由

var express = require("express")
var router = express.Router()
const db = require('../database/db.js');
const Personal = db.Personal;

// get all profile personals
router.get("/", (req, res) => {
    Personal.findAll()
      .then(personals => {
          res.json(personals)
      })
      .catch(err => {
          res.send('error: ' + err)
      })
})


// Add job
router.post("/", (req, res) => {
    if(!req.body.biography) {
        res.status(400)
        res.json({
            error: "Bad Data"
        })
    } else {
       Personal.create(req.body)
        .then(() => {
            res.send("Personal Added")
        })
        .catch(err => {
            res.send("Error: " + err)
        })
    }
})

标签： mysqlnode.jsforeign-keyssequelize.jspostman

解决方案

我认为你的 hasOne 键被颠倒了，试试这个：

db.Users.hasOne(db.Personal, {foreignKey: 'user_id', targetKey: 'fk_user_id'});

FWIW，我的偏好是在数据模型中包含 FK 字段，以提高可读性......例如

const Personal = sequelize.define('profile_personals', {
        ID: {
            type: Sequelize.INTEGER,
            primaryKey: true,
            autoIncrement: true
        },
        biography: {
            type: Sequelize.STRING
        },
        fk_user_id : {type: Sequelize.INTEGER},
    },
    {
        timestamps: false
    });

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