合并具有相同第一个键值的对象，因此其余键值将添加到合并对象

Question

嗨，我无法在任何地方找到答案。

我在创造什么？

我正在创建数据库管理面板，前面是vue.js，后面是node.js + mySQL。

有4个数据库。每个数据库行都有phone_number，e_mail，created，source_website列。

我已经从所有数据库导入了记录。我将它们推入一个对象数组中。

我想要实现的目标是什么？

我想将记录与同一封电子邮件合并，并将每个重复记录中的每个值推送到一个合并记录。

预期产出

之前：

[
    {
        "number": "111111111",
            "email": "[email protected]",
        "created": "2019-02-18T15:01:18.000Z",
        "website": "http://firstwebsite.com",
        "id": 24,
    },
    {
        "number": "111222222",
        "email": "[email protected]",
        "created": "2019-02-18T15:01:18.000Z",
        "website": "http://secondwebsite.com",
        "id": 24,
    },
]

后：

[
    {
        "number": "111111111, 111222222",
        "email": "[email protected]",
        "created": "2019-02-18T15:01:18.000Z",
        "website": "http://firstwebsite.com, http://secondwebsite.com",
        "id": 24,
    },
]

Answer 1

这可能会简化，但它正在发挥作用。

let data = [{
    "number": "111111111",
    "email": "[email protected]",
    "created": "2019-02-18T15:01:18.000Z",
    "website": "http://firstwebsite.com",
    "id": 24,
}, {
    "number": "452",
    "email": "[email protected]",
    "created": "2019-02-18T15:01:18.000Z",
    "website": "http://first.com",
    "id": 28,
}, {
    "number": "111222222",
    "email": "[email protected]",
    "created": "2019-02-18T15:01:18.000Z",
    "website": "http://secondwebsite.com",
    "id": 24,
}, {
    "number": "999",
    "email": "[email protected]",
    "created": "2019-05-18T15:01:18.000Z",
    "website": "http://first.com",
    "id": 29,
}];

// Start with an object because I will use email property as key
// for an easier checking of which email has already been looped through
let result = {};

for (let i in data) {
    let item = data[i],
        // Here the checking that I talked above
        toPush = (result[item.email]) ? result[item.email] : {};
    
    for (let property in item) {
        let value = item[property];
        
        if (!toPush[property]) {
            toPush[property] = value;
        } else {
            // If the current value is not already in the value list,
            // we add it after a ", "
            if (`${toPush[property]}`.indexOf(value) === -1) {
                toPush[property] += `, ${value}`;
            }
        }
    }
    
    result[item.email] = toPush;
}

// As we want an array as final result
result = Object.values(result);

console.log(result);

Answer 2

@ iArcadia，非常感谢你。你的回答非常有帮助。

我稍微修改了这个功能。新代码的主要特点是：

• 新的合并记录只需要一个，最新的日期而不是几个。
• 新记录收到依赖于list_1财产的新财产（例如list_2，website等）。它为新闻通讯系统管理员提供了将简报发送到不同列表的可能性。

新功能如下：

mergeRecords() {
  this.subscribers.forEach((subscriber) => {
    if(subscriber.website === 'lodzkietargi') {
      subscriber.lista_1 = 1;
    }
    else if(subscriber.website === 'targiwroclaw') {
      subscriber.lista_2 = 1;
    }
    else if(subscriber.website === 'slaskietargi') {
      subscriber.lista_3 = 1;
    }
    else if(subscriber.website === 'targi') {
      subscriber.lista_4 = 1;
    }
  });
  let result = {};
  let itemId = 1;
  for (let i in this.subscribers) {
    let item = this.subscribers[i],

    toPush = (result[item.email]) ? result[item.email] : {};
    item.id = itemId
    itemId += 1;
    if (toPush.created > item.created) {
      item.created = toPush.created;
    }
    for (let property in item) {
      let value = item[property];
      if (!toPush[property]) {
          toPush[property] = value;
      } else {
        if (property === 'website') {
            toPush.website += `, ${value}`;
        }
      }
    }
    result[item.email] = toPush;
  }

  result = Object.values(result);
  this.subscribers = result;
  console.log(result);
}

我仍然认为代码可能更好。有很多if语句。无论如何，它可能对某人有帮助。再一次，非常感谢你。你帮助了我很多。