Sequelize:声明了外键，但不出现在表中

const User = sequelize.define('User', {
  id: {
    type: Sequelize.INTEGER,
    primaryKey: true,
    autoIncrement: true
  },
  name: Sequelize.STRING
});

const Post = sequelize.define('Post', {
  id: {
    type: Sequelize.INTEGER,
    primaryKey: true,
    autoIncrement: true
  },
  title: Sequelize.STRING
});

// 声明外键和关联关系
Post.belongsTo(User, { foreignKey: 'userId' });
User.hasMany(Post, { foreignKey: 'userId' });

// 生成迁移文件
npx sequelize-cli migration:generate --name create-posts

// 编辑迁移文件
module.exports = {
  up: async (queryInterface, Sequelize) => {
    await queryInterface.createTable('Posts', {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: Sequelize.INTEGER
      },
      title: {
        type: Sequelize.STRING
      },
      userId: {
        type: Sequelize.INTEGER,
        references: {
          model: 'Users',
          key: 'id'
        }
      },
      createdAt: {
        allowNull: false,
        type: Sequelize.DATE
      },
      updatedAt: {
        allowNull: false,
        type: Sequelize.DATE
      }
    });
  },
  down: async (queryInterface, Sequelize) => {
    await queryInterface.dropTable('Posts');
  }
};

const sequelize = new Sequelize('database', 'username', 'password', {
  host: 'localhost',
  dialect: 'mysql'
});