Working with legacy tables使用遗留表
While out of the box Sequelize will seem a bit opinionated it's trivial to both legacy and forward proof your application by defining (otherwise generated) table and field names.
虽然开箱即用的Sequelize会显得有点固执己见,但是可以通过定义(否则生成)表和字段名来使用你的应用的遗留和之前的凭据,这是微不足道的。
Tables表
sequelize.define('user', { }, { tableName: 'users' });
Fields字段
sequelize.define('modelName', { userId: { type: Sequelize.INTEGER, field: 'user_id' } });
Primary keys主键
Sequelize will assume your table has a id
primary key property by default.
Sequelize将假设您的表默认具有id
主键属性
To define your own primary key:
想要定义你自己的主键:
sequelize.define('collection', { uid: { type: Sequelize.INTEGER, primaryKey: true, autoIncrement: true // Automatically gets converted to SERIAL for postgres } }); sequelize.define('collection', { uuid: { type: Sequelize.UUID, primaryKey: true } });
And if your model has no primary key at all you can use Model.removeAttribute('id');
如果你的模型根本没有主键,你可以使用 Model.removeAttribute('id');
Foreign keys外键
// 1:1 Organization.belongsTo(User, {foreignKey: 'owner_id'}); User.hasOne(Organization, {foreignKey: 'owner_id'}); // 1:M Project.hasMany(Task, {foreignKey: 'tasks_pk'}); Task.belongsTo(Project, {foreignKey: 'tasks_pk'}); // N:M User.hasMany(Role, {through: 'user_has_roles', foreignKey: 'user_role_user_id'}); Role.hasMany(User, {through: 'user_has_roles', foreignKey: 'roles_identifier'});