关于mysql：未处理的拒绝SequelizeDatabaseError：无法添加外键约束

Unhandled rejection SequelizeDatabaseError: Cannot add foreign key constraint

我有2个表：admin_user和admin_account。

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const Sequelize = require('sequelize');
module.exports = (sequelize, DataTypes) => {
var admin_user = sequelize.define('admin_user', {
id: {
autoIncrement: true,
type: Sequelize.INTEGER,
primaryKey: true
},
name: {
type: Sequelize.STRING
},
email: {
type: Sequelize.STRING,
allowNull: false,
unique: true,
validate: {
isEmail: true,
}
},
user_name:{
type: Sequelize.STRING,
allowNull: false,
unique: true
}
});

admin_user.associate = (models) =>{
admin_user.hasOne(models.admin_account, { foreignKey: 'admin_user_id' });
};

return admin_user;
};

'use strict';
const Sequelize = require('sequelize');
module.exports = (sequelize, DataTypes) => {
var admin_account = sequelize.define('admin_account', {
admin_user_id:{
type: Sequelize.INTEGER,
primaryKey: true
},
password: {
type: Sequelize.STRING
}
});
return admin_account;
};

并在创建表时出现此错误：

执行(默认)：CREATE TABLE IF NOT EXISTS admin_users(id INTEGER auto_increment，name VARCHAR(255)，email VARCHAR(255)NOT NULL UNIQUE，user_name VARCHAR(255)NOT NULL UNIQUE， createdAt DATETIME NOT NULL，updatedAt DATETIME NOT NULL，PRIMARY KEY(id))ENGINE = InnoDB;
执行(默认)：SHOW INDEX FROM admin_users FROM milkman_prod1
执行(默认)：CREATE TABLE IF NOT EXISTS admin_accounts(admin_user_id INTEGER，password VARCHAR(255)，createdAt DATETIME NOT NULL，updatedAt DATETIME NOT NULL，PRIMARY KEY(admin_user_id)，FOREIGN KEY(admin_user_id)REFERENCES admin_users(id)ON DELETE SET NULL UPDATE CASCADE)ENGINE = InnoDB;
未处理的拒绝SequelizeDatabaseError：无法添加外键约束

请尝试使用此代码：

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'use strict';
const Sequelize = require('sequelize');
module.exports = (sequelize, DataTypes) => {
var admin_account = sequelize.define('admin_user', {
admin_user_id:{
type: Sequelize.INTEGER,
primaryKey: true
},
password: {
type: Sequelize.STRING
}
});
admin_account.associate = (models) =>{
admin_account.belongsTo(models.admin_user);
};
return admin_account;
};