node.js - 嗨，聪明的人，我对(多对多)与 sequelize orm 的关联有疑问

Question

我对(多对多)与 sequelize orm 的关联有疑问

就我而言，我有 3 张 table

产品，
类别，
products_categories

这是 nodeJS 中的关联

Product.belongsToMany(Categories, {
  through: {
    model: ProductsCategories,
    as: 'products_categories',
  },
  foreignKey: "category_id"
})

Categories.belongsToMany(Product, {
  through: {
    model: ProductsCategories,
    as: 'products_categories',
  },
  foreignKey: "product_id"
})

当我尝试获取带有类别的产品时
sequelize 不会让我返回产品的类别

这里是例子

 const products = await Product.findAll({
      include:{
        model:Categories,
        nested:true,
        through:{
            model: ProductsCategories,
            as: 'products_categories',
        }
      }
    });

请帮助我了解我的错误在哪里))

Answer 1

请将您的模型定义更正为:

Product.belongsToMany(Categories, {
  through: ProductsCategories,
  as: 'products_categories',
  foreignKey: "category_id"
})

Categories.belongsToMany(Product, {
  through: ProductsCategories,
  as: 'products_categories',
  foreignKey: "product_id"
})

并找到全部:

 const products = await Product.findAll({
      include:{
        model:Categories,
        as: 'products_categories'
      }
    });