如何在连接表“belongsToMany"中添加更多字段在续集?

问题描述

我在续集中有两张桌子

1. 仓库
2. 产品项

然后我想创建一个连接表名Inventory(productionItemId,warehouseId,qty)这是我当前的代码:

Then I want to create a joined table name Inventory(productionItemId, warehouseId, qty)and Here is my current code:

Warehouse.belongsToMany(ProductItem, {
      as: "productItems",
      through: "inventories",
    });

ProductItem.belongsToMany(models.Warehouse, {
      as: "warehouses",
      through: "inventories",
    });

以上代码只创建了一个连接表inventory(productionItemId,warehouseId).我想知道我们如何在库存中添加额外的字段，例如数量等.感谢您的帮助.谢谢

The above code only create a joined table inventories(productionItemId,warehouseId). I would like to know how we can add extra field in inventories such as qty and so on.Appreciated for your help.Thank you

推荐答案

参见 官方文档中的BelongsToMany

引用:

如果你想在你的连接表中添加额外的属性，你可以在定义关联之前在sequelize中为连接表定义一个模型，然后告诉sequelize它应该使用该模型进行连接，而不是创建一个新的:

If you want additional attributes in your join table, you can define a model for the join table in sequelize, before you define the association, and then tell sequelize that it should use that model for joining, instead of creating a new one:

class User extends Model {}
User.init({}, { sequelize, modelName: 'user' })
class Project extends Model {}
Project.init({}, { sequelize, modelName: 'project' })
class UserProjects extends Model {}
UserProjects.init({
  status: DataTypes.STRING
}, { sequelize, modelName: 'userProjects' })

User.belongsToMany(Project, { through: UserProjects })
Project.belongsToMany(User, { through: UserProjects })

要向用户添加新项目并设置其状态，请将额外的 options.through 传递给 setter，其中包含连接表的属性

To add a new project to a user and set its status, you pass extra options.through to the setter, which contains the attributes for the join table

user.addProject(project, { through: { status: 'started' }})

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