通过两个值对多维数组进行分组

Question

我正在创建收件箱，正在从API检索消息，我想将它们分组以创建收件箱，我的问题是我必须按2个值对它们进行分组。我必须按标题分组（消息与产品相关-产品标题），也必须按发件人分组（因此，只有在其他人发送邮件时，我才显示2条或更多...消息）

所以我的数组看起来像：

myMessagesSorted [
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 1",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 2,
    "message": "This is just sample message 2",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 1",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 3,
    "message": "This is just sample message 3",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 1",
  },
  Object {
    "from": "Person 2",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message 1",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 1",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message 1",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 2",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 2,
    "message": "This is just sample message 2",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 2",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message 1",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 3",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 2,
    "message": "This is just sample message 2",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 3",
  },
]

我创建了一些对数组进行分组的函数：

var titles = [];
            var uniquesData = [];
            var index;
            for (var i = 0; i < myMessagesSorted.length; i++) {
                index = titles.indexOf(myMessagesSorted[i].title);
                if (index == -1) {
                    titles.push(myMessagesSorted[i].title);
                    uniquesData.push(myMessagesSorted[i]);
                }
            }
            myMessagesGrouped = uniquesData;

在这里我按标题（产品名称）对它们进行分组...问题是，对于数组中的“产品1”，我收到了来自两个不同人员（人员1和人员2）的消息...因此在这种情况下，我无法回复给两个不同的人。

如果我将by分组，那么这是相反的问题...对于相同的产品，我可以看到2条不同的消息，但是如果同一个人为其他产品发送了消息，则会被跳过...

var titles = [];
            var uniquesData = [];
            var index;
            for (var i = 0; i < myMessagesSorted.length; i++) {
                index = titles.indexOf(myMessagesSorted[i].from);
                if (index == -1) {
                    titles.push(myMessagesSorted[i].from);
                    uniquesData.push(myMessagesSorted[i]);
                }
            }
            myMessagesGrouped = uniquesData;

理想情况下，我需要像这样的分组数组：

array [
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 1",
  },
  Object {
    "from": "Person 2",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message 1",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 1",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message 1",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 2",
  },
  Object {
    "from": "Person 1",
    "fromId": "1QzUz6IJxRhrfesIFmcy1zJ0aFD3",
    "id": 1,
    "message": "This is just sample message 1",
    "postId": "-MCCl4Z-81uMIPGol-ab",
    "read": 0,
    "time": "Jul 29, 2020, 01:58 PM",
    "title": "Product 3",
  },
]

按产品名称分组，但是...仅在两个或两个以上的人询问同一产品时重复进行（这样，人们才能回复发送邮件的特定人）

我认为对我的小功能做很少的改动就可以欺骗...

谢谢！