问题描述
我在迁移具有关系的两个表时遇到问题。我想向 product.js
迁移添加外键,但它不起作用。如果我将在 await sequelize.sync();
数据库创建良好的情况下运行应用程序。
如何解决这个问题?我对另一个迁移 user
和 addresses
做了同样的事情,它按我的预期工作。感谢您的帮助。
== 20210124144301-create-product:迁移 ========
错误:无法创建表 database_development
.products
(错误号:
150 "外键约束的格式不正确")
create-category.js
迁移:
"use strict";
module.exports = {
up: async (queryInterface,Sequelize) => {
await queryInterface.createTable("сategories",{
id: {
allowNull: false,autoIncrement: true,primaryKey: true,type: Sequelize.INTEGER,},name: {
type: Sequelize.STRING,allowNull: false,unique: true,description: Sequelize.TEXT,createdAt: {
allowNull: false,type: Sequelize.DATE,updatedAt: {
allowNull: false,});
},down: async (queryInterface,Sequelize) => {
await queryInterface.dropTable("сategories");
},};
create-product.js
迁移:
"use strict";
module.exports = {
up: async (queryInterface,Sequelize) => {
await queryInterface.createTable("products",categoryId: {
type: Sequelize.INTEGER,references: {
model: "categories",key: "id",description: {
type: Sequelize.TEXT,price: {
type: Sequelize.DOUBLE(11,2).UNSIGNED,defaultValue: 0,Sequelize) => {
await queryInterface.dropTable("products");
},};
category.js
模型:
"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize,DataTypes) => {
class Category extends Model {
/**
* Helper method for defining associations.
* This method is not a part of Sequelize lifecycle.
* The `models/index` file will call this method automatically.
*/
static associate(models) {
this.hasMany(models.Product,{
foreignKey: "categoryId",});
}
}
Category.init(
{
name: {
type: DataTypes.STRING,description: DataTypes.TEXT,{
sequelize,tableName: "categories",modelName: "Category",}
);
return Category;
};
product.js
模型:
"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize,DataTypes) => {
class Product extends Model {
/**
* Helper method for defining associations.
* This method is not a part of Sequelize lifecycle.
* The `models/index` file will call this method automatically.
*/
static associate(models) {
this.belongsTo(models.Category,});
}
}
Product.init(
{
name: {
type: DataTypes.STRING,description: {
type: DataTypes.TEXT,price: {
type: DataTypes.DOUBLE(11,tableName: "products",modelName: "Product",}
);
return Product;
};
解决方法
您需要在产品和类别模型文件中添加主键 (id) 也会更改您的模型关联。
product.js
"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize,DataTypes) => {
class Product extends Model {
/**
* Helper method for defining associations.
* This method is not a part of Sequelize lifecycle.
* The `models/index` file will call this method automatically.
*/
static associate(models) {
Product.belongsTo(models.Category,{
foreignKey: "categoryId",});
}
}
Product.init(
{
productId: {
allowNull: false,autoIncrement: true,primaryKey: true,type: DataTypes.INTEGER
},name: {
type: DataTypes.STRING,allowNull: false,},description: {
type: DataTypes.TEXT,price: {
type: DataTypes.DOUBLE(11,2).UNSIGNED,defaultValue: 0,categoryId: {
type: DataTypes.INTEGER
}
},{
sequelize,tableName: "products",modelName: "Product",}
);
return Product;
};
类别.js
"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize,DataTypes) => {
class Category extends Model {
/**
* Helper method for defining associations.
* This method is not a part of Sequelize lifecycle.
* The `models/index` file will call this method automatically.
*/
static associate(models) {
Category.hasMany(models.Product,});
}
}
Category.init(
{
categoryId: {
allowNull: false,unique: true,description: DataTypes.TEXT,tableName: "categories",modelName: "Category",}
);
return Category;
};