如何从 sequelize 中的实例中排除关联 belongs-to-many？

Question

我试图从与模型关联的查询中排除联结模型，这就是它们的关联方式：

Warehouse.associate = function(models) {
  Warehouse.Products = Warehouse.belongsToMany(models.Product, {
    as: {
      singular: 'product',
      plural: 'products',
    },
    through: models.WarehouseProducts,
    foreignKey: "warehouse_id",
    otherKey: "product_id",
    onDelete: 'CASCADE',
    onUpdate: 'CASCADE'
  });
}

Product.associate = function(models) {
  Product.Warehouses = Product.belongsToMany(models.Warehouse, {
    as: {
      singular: "warehouse",
      plural: "warehouses"
    },
    through: models.WarehouseProducts,
    foreignKey: "product_id",
    otherKey: "warehouse_id",
    onDelete: 'CASCADE',
    onUpdate: 'CASCADE'
  });
}

这是我用来检索仓库产品的代码：

export const prefetchWarehouse =  [
  validator.params.warehouse,
  async function(req, res, next) {
    try {
      if (validator.errors(req)) {
        throw validator.stack;
      } else {
        req.warehouse = await Warehouse.findById(req.params.warehouse);
        next();
      }
    } catch (err) {
      next(err);
    }
  }
];

export const getProduct = [
  validator.params.product,
  async function(req, res, next) {
    const result = await req.warehouse.getProducts({
      where: {
        id: {
          [Op.eq]: req.params.product
        }
      },
      plain: true
    });
    console.log('===>', result);
  }
]

这是输出：

有什么办法可以避免无法恢复该关联？

Answer 1

解决这个问题的一种方法是在我的处理程序中使用连接模型来避免它：

export function WarehouseProducts(WarehouseProducts) {
  WarehouseProducts.associate = function(models) {
    WarehouseProducts.Products = WarehouseProducts.belongsTo(models.Product, {
      as: "product"
    });
  };
}

然后在处理程序中：

const result = await WarehouseProducts.findOne({
  where: {
    warehouse_id: { [Op.eq]: req.params.warehouse },
    product_id: { [Op.eq]: req.params.product }
  },
  include: [ "product" ]
});

res.json(result.product);

尽管如此，如果按照我正在寻找的方式进行操作会很好，因为在其他端点中重复使用了相同的函数 "prefetchWarehouse"，因此这将有助于避免。尽管代码看起来更优化了，但无论如何，如果有人有任何建议，我将不胜感激。

谢谢。

Answer 2

我运行遇到过这种行为，我通过将 joinTableAttributes 设置为一个空数组来解决它，就像 joinTableAttributes: [].

export const getProduct = [
  validator.params.product,
  async function(req, res, next) {
    const result = await req.warehouse.getProducts({
      joinTableAttributes: [], // Here
      where: {
        id: {
          [Op.eq]: req.params.product
        }
      },
      plain: true
    });
    console.log('===>', result);
  }
]

希望对你有帮助。

如何从 sequelize 中的实例中排除关联 belongs-to-many？

How to exclude association belongs-to-many from an instance in sequelize?

database

orm

relational-database

sequelize.js