如何从 sequelize join 中删除 hasMany id 属性？

Question

我正在尝试以一对多关系加入下面定义的两个 table。许多 ReviewCharacteristics 的一个特征。使用以下 findAll 函数，我试图对 ReviewCharacteristics table 中的值进行平均。我已经验证了应该按预期运行的必要 SQL 命令。 Sequelize 在所选属性中包含 ReviewCharateristic.id，这导致我的分组失败。

有没有一种方法可以仅指定平均值而不在所选属性中包含来自 ReviewCharacteristic table 的 ID？

exports.Characteristic = db.define('characteristic', {
  product_id: {
    type: DataTypes.INTEGER,
    allowNull: false
  },
  name: {
    type: DataTypes.STRING(7),
    allowNull: false
  }
}, { underscored: true });

exports.ReviewCharacteristic = db.define('review_characteristic', {
  value: {
    type: DataTypes.INTEGER,
    allowNull: false
  }
}, { underscored: true });

exports.Characteristic.hasMany(exports.ReviewCharacteristic, { as: 'rc' });
exports.ReviewCharacteristic.belongsTo(exports.Characteristic);

Characteristic.findAll({
  attributes: ['name', 'id'],
  where: {
    product_id: req.query.product_id
  },
  group: 'characteristic.id',
  include: [{
    model: ReviewCharacteristic,
    as: 'rc',
    attributes: [[Sequelize.fn('AVG', Sequelize.col('rc.value')), 'value']],
    required: true
  }]
});

我也试过指定 attributes: ['characteristic.name', 'characteristic.id']

当前：

SELECT 
"characteristic"."name", 
"characteristic"."id", 
"rc"."id" AS "rc.id", 
AVG("rc"."value") AS "rc.value" 
FROM "characteristic" AS "characteristic" 
INNER JOIN "review_characteristic" AS "rc" 
ON "characteristic"."id" = "rc"."characteristic_id" 
WHERE "characteristic"."product_id" = '18078' 
GROUP BY "characteristic"."id";

预计：

SELECT 
"characteristic"."name", 
"characteristic"."id",
AVG("rc"."value") AS "rc.value" 
FROM "characteristic" AS "characteristic" 
INNER JOIN "review_characteristic" AS "rc" 
ON "characteristic"."id" = "rc"."characteristic_id" 
WHERE "characteristic"."product_id" = '18078' 
GROUP BY "characteristic"."id";

Answer 1

如果有人碰巧遇到这个问题并且正在处理同样的问题，这里是我找到的解决方案。

Characteristic.findAll({
  attributes: ['name', 'id', [Sequelize.fn('AVG', Sequelize.col('rc.value')), 'value']],
  where: {
    product_id: req.query.product_id
  },
  group: 'characteristic.id',
  include: [{
    model: ReviewCharacteristic,
    as: 'rc',
    attributes: [],
    required: true
  }]
});

为了在我的例子中停止添加 ReviewCharateristic.id 属性，必须将属性指定为已连接 table 的空数组。

如何从 sequelize join 中删除 hasMany id 属性？

How to remove hasMany id attribute from sequelize join?

postgresql

join

sequelize.js