Question

我有两种模式：

BusinessEntity和
Invoice

我希望Invoice有seller和buyer，两者都指向BusinessEntity条记录。因此，我希望在invoices表格（Invoice模型）中包含两个字段：seller_id和buyer_id。

所以，我做了这样的事情：

的 BusinessEntity

const BusinessEntity = sequelize.define("business_entity", {
    display_name: Sequelize.STRING
});

的 Invoice

const Invoice = sequelize.define("invoice", {
    series: Sequelize.STRING,
    number: Sequelize.INTEGER,
    ...
});

// Indeed, this creates the seller_id and buyer_id fields in the invoice
Invoice.belongsTo(BusinessEntity, { as: "seller" });
Invoice.belongsTo(BusinessEntity, { as: "buyer" });

我打电话给Invoice.belongsTo(BusinessEntity)似乎并不自然，但如果我这样做：

BusinessEntity.belongsTo(Invoice, { as: "seller" });
BusinessEntity.belongsTo(Invoice, { as: "buyer" });

...根本不会创建seller_id和buyer_id列。为什么呢？

我已成功插入发票，从business_entities表格中分配ID。

如果我想Invoice输出include和seller，我应该如何查询buyer？

我试过了：

 Invoice.findOne({ include: [BusinessEntity] })

但是这个错误就失败了：

 business_entity is not associated to invoice!

正确的方法是什么？如何解决问题？

Answer 1

当您执行findOne查询时：Invoice.findOne({ include: [BusinessEntity] })同样重要的是提及别名。

因此，您需要的查询具有以下格式：

Invoice.findOne({
  include: [
    // Include the seller
    { model: BusinessEntity, as: 'seller' },
    // ...and the buyer
    { model: BusinessEntity, as: 'buyer' }
  ]
})

将一个Sequelize模型链接到另一个模型中的两个不同字段

1 个答案: