Question

我有以下关系：

var Order = sequelize.define('order', {
  id : {
    type          : Sequelize.INTEGER,
    primaryKey    : true,
    autoIncrement : true
  },
  amount       : { type : Sequelize.DOUBLE },
  change       : { type : Sequelize.DOUBLE },
  status       : { type : Sequelize.ENUM('draft', 'placed', 'in_transit', 'fulfilled', 'rejected') },
  statusReason : { type : Sequelize.STRING },
  address      : { type : Sequelize.STRING },
  latitude     : { type : Sequelize.DOUBLE },
  longitude    : { type : Sequelize.DOUBLE }
})

var Beverage = sequelize.define('beverage', {
  id : {
    type          : Sequelize.INTEGER,
    primaryKey    : true,
    autoIncrement : true
  },
  name    : { type : Sequelize.STRING },
  picture : { type : Sequelize.STRING },
  price   : { type : Sequelize.DOUBLE },
  max     : { type : Sequelize.DOUBLE },
})

var OrderBeverage = sequelize.define('orderBeverage', {
  id : {
    type          : Sequelize.INTEGER,
    primaryKey    : true,
    autoIncrement : true
  },
  orderId    : { type : Sequelize.INTEGER },
  beverageId : { type : Sequelize.INTEGER },
  amount     : { type : Sequelize.INTEGER }
})

Order.hasMany(OrderBeverage, { as : 'beverages' })
OrderBeverage.belongsTo(Beverage)
OrderBeverage.belongsTo(Order)

所以，如果我做一个包含关系的简单查询，我有以下来源和结果：

let orders = yield Order.findAll({
  include : [{
    model      : Order.Beverage,
    as         : 'beverages',
    attributes : ['createdAt'],
    include    : [ Beverage ]
  }]
})

和结果json：

[
  {
    "id": 2,
    "amount": 0,
    "change": 0,
    "status": "placed",
    "statusReason": "wrong address given",
    "address": "street x, michigan",
    "latitude": 0,
    "longitude": 0,
    "createdAt": "2016-01-12T22:39:32.000Z",
    "updatedAt": "2016-01-13T21:05:06.000Z",
    "beverages": [
      {
        "createdAt": "2016-01-12T23:10:48.000Z",
        "beverage": {
          "id": 1,
          "name": "Vodka",
          "picture": "somepic",
          "price": 30,
          "max": 5,
          "createdAt": "2016-01-12T22:26:10.000Z",
          "updatedAt": "2016-01-12T22:26:10.000Z"
        }
      }
    ]
  }
]

我需要将属性beverages设为饮料内容的数组，而不是{ createdAt, beverage }饮料的内容在beverage内的数组}键。

最终结果如下：

[
  {
    "id": 2,
    "amount": 0,
    "change": 0,
    "status": "placed",
    "statusReason": "wrong address given",
    "address": "street x, michigan",
    "latitude": 0,
    "longitude": 0,
    "createdAt": "2016-01-12T22:39:32.000Z",
    "updatedAt": "2016-01-13T21:05:06.000Z",
    "beverages": [
      {
          "id": 1,
          "name": "Vodka",
          "picture": "somepic",
          "price": 30,
          "max": 5,
          "createdAt": "2016-01-12T22:26:10.000Z",
          "updatedAt": "2016-01-12T22:26:10.000Z"
      }
    ]
  }
]

我搜索过文档但找不到它。有什么想法吗？

Answer 1

好的，所以我想出了如何实现这一目标。无论如何，不直观。

而不是与hasMany使用OrderBeverage关系：

Order.hasMany(OrderBeverage, { as : 'beverages' })

我们必须通过belongsToMany与Beverage使用OrderBeverage关系：

Order.belongsToMany(Beverage, { through : 'orderBeverage' })

有了它，我们只需将查询修改为：

let orders = yield Order.findAll({
  include : [{
    model : Beverage
  }]
})

我认为这没有多大意义，因为饮料属于许多 orderBeverage ，而不是订单属于许多饮料到 orderBeverage 。

从某种意义上说，饮料属于订单到 orderBeverage 。

也许我误解了这个想法和概念......

续集多对多格式化程序

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