外键约束NULL

Question

我的项目有一个用户，而该用户有一个联系人。

因此，我正在使用belongsTo和HasOne。当我运行代码时，我的联系表将使用外键列创建，但是当我输入信息时，我的foreignKey列将显示“ NULL”。

db.js

db.sequelize = sequelize
db.Sequelize = Sequelize

db.Users = require('../model/User.js')(sequelize, Sequelize);
db.Contacts = require('../model/Contact.js')(sequelize, Sequelize);

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

 sequelize.sync().then(function() {
  console.log("Database Connection Succeful");
}, function(err) {
  console.log(err);
})

module.exports = db

（型号）

User.js

const Sequelize = require('sequelize')
    const db = require("../database/db.js")

    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
    }


Contact.js 

    module.exports = (sequelize, Sequelize) => {
        const Contact = sequelize.define('profile_contacts', {
            ID: {
                type: Sequelize.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            phone: {
                type: Sequelize.STRING
            },
            linkedin_profile: {
                type: Sequelize.STRING
            }
        },
        {
            timestamps: false
        });
        return Contact
    }