快递js + Sequelize和钩子

Posted 2021-04-29

我正在开发一个应用程序，我需要在创建对象时进行额外的验证。

我尝试使用hooks和beforeValidate函数，但它不起作用。如果提交的值大于db中的值（基于自定义查询的计算值），我试图验证失败。

Transaction.beforeValidate(function(transaction, options) {

    sequelize.query(
      'SELECT SUM(IF(type = "buy", number_of_shares, number_of_shares * -1)) as remaining FROM transactions WHERE account_id = $account_id',
      { 
        bind: { 
          account_id: req.body.account_id 
        }, 
        type: sequelize.QueryTypes.SELECT 
      }
    ).then(result => {
      if (req.body.type == "sell" && result.remaining < req.body.number_of_shares) {
        throw error('Number of remaining shares is less than what you are trying to sell.') // psudeo code
      }
    }).then(result => {
      return sequelize.Promise.resolve(user);
    })
  })

答案

你在return之前错过了一个sequelize.query(。

return sequelize.query(