sequelize - 在使用內部聯接時為 SELECT 查詢指定屬性

Question

我想從主表帳戶中獲取並將其與帳戶歷史記錄進行比較。 兩個表之間存在 On To many 關系

SELECT account."userName", (account."postNumber" - accountHistory."postNumber") AS postNumber
    FROM public."Accounts" AS account  INNER JOIN public."AccountHistories" AS accountHistory
    ON account."userName" = accountHistory."userName" 
    WHERE accountHistory."scrappingDate" = '2022-01-08 23:59:39+01'
    ORDER BY postNumber DESC;

我的問題是如何使用 sequilize 進行查詢？ 我試過了，但我無法更改屬性的名稱並進行減法

await this.accountRepository.findAll({    
    where: {'$accountHistory.createdAt$' : '2022-01-08 23:59:39+01'},
    include: [{
      model: AccountHistory,
      required: false
    }],
    attributes: ['userName',['$accountHistory.postNumber $', 'postNumber '],postNumber ],
   order: [[$accountHistory.createdAt$', 'DESC']],
                    })

Answer 1

您可能需要使用Sequelize.literal將計算作為別名屬性執行，例如：

const { literal } = require('sequelize')

await this.accountRepository.findAll({    
    where: {'$accountHistory.createdAt$' : '2022-01-08 23:59:39+01'},
    include: [{
      model: AccountHistory,
      required: false
    }],
    attributes: [
      'userName',
      [
        literal('"account"."postNumber" - "accountHistory"."postNumber"'),
        'postNumber'
      ]
    ],
   order: [[$accountHistory.createdAt$', 'DESC']],
})

根據您的 SQL 方言，該確切語法可能不起作用 - 我不熟悉您使用的$符號