[英]Has one association in Sequelize
我有一個用戶 Model 與角色 Model 的 hasOne 關系
User.init({
id: {
type: DataTypes.INTEGER.UNSIGNED,
autoIncrement: true,
primaryKey: true
},
name: {
type: DataTypes.STRING,
allowNull: false
},
//email, password, and other fields, ...
roleId: {
type:DataTypes.INTEGER,
allowNull: false
}},
{
sequelize,
tableName: "Users"
});
User.hasOne(Role)
和一個角色 Model
Role.init({
id: {
type: DataTypes.INTEGER.UNSIGNED,
autoIncrement: true,
primaryKey: true
},
name: {
type: DataTypes.STRING,
allowNull: false
}},
{
sequelize,
tableName: "Roles"
});
當我嘗試創建一個新角色時
await Role.create(req.body)
請求是
POST http://localhost:3000/api/role
Content-Type: application/json
Authorization: Bearer <token>
{
"name": "test role"
}
我收到錯誤column "UserId" does not exist
日志說是:
routine: 'errorMissingColumn',
sql: 'INSERT INTO "Roles" ("id","name") VALUES (DEFAULT,$1) RETURNING "id","name","UserId";',
parameters: [
'test role'
]
我在這里做錯了什么? 我的表只有Users
表中的roleId
, Roles
表中的UserId
是哪里來的?
遷移
'use strict';
module.exports = {
up: (queryInterface, Sequelize) => {
return queryInterface.createTable('Roles', {
id: {
allowNull: false,
autoIncrement: true,
primaryKey: true,
type: Sequelize.INTEGER
},
name: {
type: Sequelize.STRING,
allowNull: false
}
});
},
down: (queryInterface, Sequelize) => {
return queryInterface.dropTable('Roles');
}
};
'use strict';
module.exports = {
up: (queryInterface, Sequelize) => {
return queryInterface.createTable('Users', {
id: {
allowNull: false,
autoIncrement: true,
primaryKey: true,
type: Sequelize.INTEGER
},
name: {
type: Sequelize.STRING
},
// other fields
roleId: {
type: Sequelize.INTEGER,
references: {
model: "Roles",
key: "id"
}
}
});
},
down: (queryInterface, Sequelize) => {
return queryInterface.dropTable('Users');
}
};
如果我在角色 Model 中添加Role.belongsTo(User)
,則會收到錯誤消息:
models init error: TypeError: Cannot read property 'name' of undefined
對於要按照架構建議存儲在用戶表中的角色: User.belongsTo(Role)
將為您設置映射RoleId
。
Model 以與遷移相反的方式設置外鍵,因此導致缺少UserID
列。
除非您想自定義字段,否則不需要在架構中定義外鍵。 然后在關聯調用上定義belongsTo
/ hasOne
選項。
const { Sequelize, Model, DataTypes } = require('sequelize')
const sequelize = new Sequelize('sqlite::memory:')
class User extends Model {}
class Role extends Model {}
User.init({
id: {
type: DataTypes.INTEGER.UNSIGNED,
autoIncrement: true,
primaryKey: true
},
name: {
type: DataTypes.STRING,
allowNull: false
}},
{
sequelize,
tableName: "Users"
});
Role.init({
id: {
type: DataTypes.INTEGER.UNSIGNED,
autoIncrement: true,
primaryKey: true
},
name: {
type: DataTypes.STRING,
allowNull: false
}},
{
sequelize,
tableName: "Roles"
});
User.belongsTo(Role, { foreignKey: 'roleId' })
然后你可以用協會做事
async function go(){
await sequelize.sync()
const role = await Role.create({ name: 'atester' })
const user = await User.create({ name: 'test' })
await user.setRole(role)
console.log("%j", await User.findAll({ include: Role }))
}
go().catch(console.error)
結果生成如下文件:
{
"id": 1,
"name": "test",
"createdAt": "2020-12-04T09:44:05.762Z",
"updatedAt": "2020-12-04T09:44:05.763Z",
"roleId": 1,
"Role": {
"id": 1,
"name": "atester",
"createdAt": "2020-12-04T09:44:05.758Z",
"updatedAt": "2020-12-04T09:44:05.758Z"
}
}
從那里您可以將遷移匹配到數據庫。
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