Question

我在 sequelize (v6.3.5) 中遇到 n:m 关系问题，通常使用此代码我应该自动创建第三个表“Product_File”，但是当我调用 product.addFile(file) 时，我有错误“SequelizeDatabaseError：表‘Product_File’不存在”

产品：

"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize, DataTypes) => {
  class Product extends Model {
    static associate(models) {
      this.belongsToMany(models.File, {
        through: "Product_File",
      });
    }
  }
  Product.init(
    {
      name: DataTypes.STRING,
      description: DataTypes.TEXT,
      category_id: DataTypes.INTEGER,
      references: DataTypes.STRING,
    },
    {
      sequelize,
      modelName: "Product",
    }
  );
  Product.sync().catch((err) => console.error(err));
  return Product;
};

文件：

"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize, DataTypes) => {
  class File extends Model {
    static associate(models) {
      this.belongsToMany(models.Product, {
        through: "Product_File",
      });
    }
  }
  File.init(
    {
      name: DataTypes.STRING,
      type: DataTypes.STRING,
      url: DataTypes.STRING,
    },
    {
      sequelize,
      modelName: "File",
    }
  );
  File.sync().catch((err) => console.error(err));
  return File;
};

Answer 1

Product_File.js

"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize, DataTypes) => {
    class Product_File extends Model {
    }
    Product_File.init({
        productId: {
            type: DataTypes.INTEGER,
            allowNull: false,
            references: {
                model: 'Products',
                key: 'id',
            },
        },
        fileId: {
            type: DataTypes.INTEGER,
            allowNull: false,
            references: {
                model: 'Files',
                key: 'id',
            }
        },
    }, {
        sequelize,
        modelName: "Product_File",
    });
    return Product_File;
};

Product.js

...
    this.belongsToMany(models.File, {
        foreignKey: 'productId',
        otherKey: 'fileId',
        through: models.Product_File,
        as: 'file'
      })
...

Test.js

'use strick';


const Sequelize = require("sequelize");
const Op = Sequelize.Op;
const db = require("../models");

describe('db', () => {

    it('Check Product: m:n relationship', async () => {

        let A = await db.Product.findAll({
            include: ['file'],
        });
        var aList = JSON.parse(JSON.stringify(A))
        console.log(aList)
        return
    })
})

输出

[
  {
    id: 1,
    name: 'Product 1',
    description: null,
    category_id: null,
    references: null,
    createdAt: null,
    updatedAt: null,
    file: [ [Object] ]
  }
]

关系表不存在

1 个答案: