sequelize - 在使用内连接时为 SELECT 查询指定属性

Question

我想从主 table 帐户中获取数据并将其与帐户历史记录进行比较。两者之间存在On To many关系table

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;

我的问题是如何使用 sequilize 进行查询？我试过了，但我无法更改属性的名称并进行减法

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 作为别名属性执行计算，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']],
})

根据您的 SQL 方言，确切的语法可能不起作用 - 我不熟悉您使用的 $ 符号

sequelize - 在使用内连接时为 SELECT 查询指定属性

sequelize - Specifying attributes for SELECT queries while using inner join

javascript

sql

node.js

sequelize.js

nestjs