如何使用Sequelize对Postgres执行日期比较 [英] How to perform date comparisons against postgres with sequelize

问题描述

我想删除所有日期早于20分钟的记录.我提供的裸javascript Date 对象作为比较值，Postgres(或Sequelize)不满意.

I want to delete all records with dates before 20 minutes ago. Postgres (or Sequelize) is not satisfied with the bare javascript Date object I provide as the comparison value.

我在postgres 9.6数据库上使用sequelize 4.37.

I'm using sequelize 4.37 on top of a postgres 9.6 database.

有问题的列用 type:Sequelize.DATE 声明，研究表明该列等效于 TIMESTAMP WITH TIME ZONE :完整的日期和时间，微秒精度，时区指示符.(这也是我使用psql CLI工具描述表时看到的.)

The column in question was declared with type: Sequelize.DATE, which research suggests is equivalent to TIMESTAMP WITH TIME ZONE: a full date and time with microsecond precision and a timezone signifier. (That is also what I see when I use the psql CLI tool to describe the table.)

所以，我这样做:

const Sequelize = require('sequelize')
const { SomeModel } = require('../models.js')

// calculate 20 minutes ago
async function deleteStuff() {
  const deletionCutoff = new Date()
  deletionCutoff.setMinutes( deletionCutoff.getMinutes() - 20 ) 

  await SomeModel.destroy({
    where: {
      [ Sequelize.Op.lt ]: { dateColumn: deletionCutoff }
    }
  })

但是我得到这个错误:

Error: Invalid value { dateColumn: 2018-11-21T21:26:16.849Z }

文档建议我应该能够提供裸露的JavaScript日期或ISO8601字符串，但两者均会引发相同的 Invalid Value 错误.唯一的区别是，如果我传递字符串，则错误将在值周围显示单引号:

The docs suggest I should be able to provide either a bare javascript Date, or an ISO8601 string, but both throw the same Invalid Value error. The only difference is that, if I pass a string, the error shows single quotes around the value:

// error when dateColumn: deletionCutoff.toISOString()
Error: Invalid value { dateColumn: '2018-11-21T21:26:16.849Z' }

推荐答案

嗯，这很尴尬.我错误地构造了 where 子句.

Well, this is pretty embarrassing. I structured the where clause incorrectly.

// BAD CODE
await SomeModel.destroy({
  where: {
    [ Sequelize.Op.lt ]: {
      dateColumn: deletionCutoff
    }
  }
})


// GOOD CODE
await SomeModel.destroy({
  where: {
    dateColumn: {
      [ Sequelize.Op.lt ]: deletionCutoff
    }
  }
})

也许我应该删除问题.也许不是，我得到的错误可能会更有帮助.

Maybe I should delete the question. Maybe not -- the error I got probably could be more helpful.

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