findOrCreate 包含 - sequelize.js

问题描述

我想创建一个 Tournament(如果不存在)和一个与该锦标赛关联的 Match(如果不存在).

I want to create a Tournament (if not exists), and a Match (if not exists) associated to the Tournament.

let [match, created] = await Match.findOrCreate( {
  where: {scoreHome: 97, Tournament: {name: "USA South Men's Basketball"}}, 
  include: [Tournament]
})

如果美国南方男篮"锦标赛已经在数据库中(假设 id 为 1)，那么应该使用 TournamentId: 1 创建比赛.如果数据库中已经有比赛 {scoreHome: 97 和 TournamentId: 1}，则不应创建匹配项.

If the tournament 'USA South Men's Basketball' is already in the db (let's say with id 1), then the match should be created with TournamentId: 1. If there is already a match in the db with {scoreHome: 97 and TournamentId: 1}, then no match should be created.

  let Match = sequelize.define('Match', {
    scoreHome: DataTypes.INTEGER,
    //...
  })

  Match.associate = models => {
    Match.belongsTo(models.Tournament)
  }

编辑这是错误:

[错误:无效值[object Object]]

[Error: Invalid value [object Object]]

这很好用

let match = await Match.create({
    scoreHome: 97, Tournament: {name: "USA South Men's Basketball"}
  },{include: [Tournament]}
})

推荐答案

我不确定 sequelize 是否会允许这个deep findOrCreate".但是您可以使用两个查询来达到想要的效果，并使用 sequelize 事务来确保两者链接在一起:

I am not sure sequelize will allow this "deep findOrCreate". But you can achieve the wanted effect using two queries, and the sequelize transaction to make sure the two are linked together:

const t = await sequelize.transaction();

try {
  const [tournament] = await Tournament.findOrCreate({
    where: {name: "USA South Men's Basketball"},
    { transaction: t }
  })
  const [match] = await Match.findOrCreate({
    where: {scoreHome: 97, tournamentId: tournament.id},
    { transaction: t }
  })
  t.commit()
} catch(err){
  t.rollback()
}

它有点冗长，但这样你就可以确定你在做什么，并且(个人意见)对于在你之后阅读的其他开发人员来说更具可读性.

It is a bit more verbose, but with this you are sure of what you do, and it is also (personal opinion) more readable for another dev reading that after you.

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