动态 return 配置值 (node.js)

Question

我正在构建一个内容中间件，它从我们的外部发布者那里收集内容。发布者将在 rss 或 json 中共享他们的内容，并且 key/value 字段将彼此不同。为了让事情变得更简单，我创建了一个配置文件，我可以在其中预定义 key/value 和提要类型。问题是，我如何根据发布者名称动态 return 这个配置值。

示例：要获取 Publisher #1 提要类型，我可以使用 config.articles.rojak_daily.url_feed

我的配置文件/config/index.js

module.exports = {
    batch:100,
    mysql: {
        database: process.env.database,
        host: process.env.host,
        username: process.env.username,
        password: process.env.password
    },
    articles:{
        rojak_daily:{ // Publisher 1
            url: 'xxx',
            url_feed: 'rss',
            id: null,
            Name: 'title',
            Description: 'description',
            Link: 'link',
            DatePublishFrom: 'pubDate',
            LandscapeImage: 's3image',
            SiteName: 'Rojak Daily',
            SiteLogo: null
        },
        rojak_weekly:{ // publisher 2
            url: 'xxx',
            url_feed: 'json',
            id: null,
            Name: 'Name',
            Description: 'Desc',
            Link: 'link',
            DatePublishFrom: 'pubDate',
            LandscapeImage: 's3image',
            SiteName: 'Rojak Weekly',
            SiteLogo: null
        }
    }
}

我的主要应用脚本

const config = require('@config'); // export from config file

class Main {
    constructor(){
      this.publishers = ['rojak_daily','rojak_weekly'];
    }

    // Main process
    async startExport(){
        try{
            for(let publisher of this.publishers){
                const feedType =  await this.getFeedType(publisher)
                const result = (feedType == 'rss')? await this.rss.start(publisher): await this.json.start(publisher)
                return result
            }
        }catch(err){
            console.log("Error occured: ", err)
        }


    }

    // Get feed type from config
    async getFeedType(publisher){
      return await config.articles.rojak_daily.url_feed; 
      // this only return publisher 1 url feed.
      // my concern is to dynamically passing variable 
      // into this config file (example: config.articles.<publisher>.url_feed)
    }

}

module.exports = Main

Answer 1

您可以使用 Object.entries(articles) or Object.values(articles) in conjunction with Array.prototype.forEach() 遍历文章，或者由于您已经有了出版商的名称，您可以使用 config.articles[publisher].url_feed 访问该条目，如下所示：

const config = {
  articles: {
    rojak_daily: { // Publisher 1
      url: 'xxx',
      url_feed: 'rss',
      id: null,
      Name: 'title',
      Description: 'description',
      Link: 'link',
      DatePublishFrom: 'pubDate',
      LandscapeImage: 's3image',
      SiteName: 'Rojak Daily',
      SiteLogo: null
    },
    rojak_weekly: { // publisher 2
      url: 'xxx',
      url_feed: 'json',
      id: null,
      Name: 'Name',
      Description: 'Desc',
      Link: 'link',
      DatePublishFrom: 'pubDate',
      LandscapeImage: 's3image',
      SiteName: 'Rojak Weekly',
      SiteLogo: null
    }
  }
}

const publishers = ['rojak_daily', 'rojak_weekly']

function getFeedType(publisher) {
  return config.articles[publisher].url_feed; 
}

publishers.forEach(publisher => console.log(getFeedType(publisher)));

Answer 2

async getFeedType(publisher){
    return await config.articles[publisher].url_feed; 
}

您可以通过变量访问对象的属性

动态 return 配置值 (node.js)

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