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Nodejs-Express-API中处理可选查询字符串参数的最佳实践

query-parameters if-statement express node.js javascript

Emad Dehnavi · 技术社区 · 7 年前

let songName = req.query.songName
let singerName = req.query.singerName
let albumName = req.query.albumName
let publishDate = req.query.publishDate

if(songName && singerName && albumName && publishDate) {
   const response = songs.filter(c => { 
      return c.songName === songName && c.singerName === singerName && c.albumName === albumName && c.publishDate === publishDate
   }
   res.send({
      "Data" : response
   })
}

if(songName && singerName && albumName && !publishDate) {
   const response = songs.filter(c => { 
      return c.songName === songName && c.singerName === singerName && c.albumName === albumName
   }
   res.send({
      "Data" : response
   })
}

if(songName && singerName && !albumName && publishDate) {
   const response = songs.filter(c => { 
      return c.songName === songName && c.singerName === singerName && c.publishDate === publishDate
   }
   res.send({
      "Data" : response
   })
}

if(songName && !singerName && albumName && publishDate) {
   const response = songs.filter(c => { 
      return c.songName === songName && c.albumName === albumName && c.publishDate === publishDate
   }
   res.send({
      "Data" : response
   })
}

if(!songName && singerName && albumName && publishDate) {
   const response = songs.filter(c => { 
      return c.singerName === singerName && c.albumName === albumName && c.publishDate === publishDate
   }
   res.send({
      "Data" : response
   })
}
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3 回复 | 直到 7 年前

Steffen Schmitz 7 年前

您可以使用三元运算符在一个查询中完成此操作。如果定义了参数,则检查是否相等,否则只返回true。可能是这样的:

const response = songs.filter(c => {
    return (songName ? (c.songName === songName) : true) &&
           (singerName ? (c.singerName === singerName) : true) &&
           (albumName ? (c.albumName === albumName) : true);
});

res.send({
    "Data": response
})

Anton Harniakou 7 年前

我可能会发现Lodash对这个很有用:

const response = songs.filter(song => {
   return _.isEqual(req.query, _.pick(song, Object.keys(req.query)))
})

Shaharyar 7 年前

Joi

它是一个非常强大的javascript验证库。您甚至可以使用它进行条件验证。见 complete docs .

我在这里为您的场景创建了基本模式。

// validation
const schema = Joi.object().keys({
    songName: Joi.string()
    singerName: Joi.string()
    albumName: Joi.string()
    publishDate: Joi.date()
});

const { error, value } = Joi.validate(req.query, schema, { abortEarly: false, allowUnknown: false });
if (error !== null) return res.send(400, { code: 400, message: "validation error", error: error.details });

对于其他开发人员来说,它也更容易阅读和理解。您可以将整个项目中的验证标准化。