从对象数组中删除重复项并将其子数组合并为一个

Question

我有一个对象数组，其中有一个数据索引作为子数组。对象数组返回重复值。所以我必须对其进行分组，使其包含所有关键字段，所有数据都合并在该数组的数据索引。

这是我得到的示例代码：

"Todo": [
        {
            "AreaId": 4,
            "AreaName": "Hall",
            "Sequence": 3,
            "Data": [
                {
                    "AssetId": 2,
                    Some OtherFields,

                }
            ]
        },
        {
            "AreaId": 4,
            "AreaName": "Hall",
            "Sequence": 3,
            "Data": [
                {
                    "AssetId": 3,
                     Some OtherFields,
                }
            ]
        },


        {
                "AreaId": 2,
                "AreaName": "Hall",
                "Sequence": 1,
                "Data": [
                    {
                        "AssetId": 4,
                        Some OtherFields,

                    }
                ]
            },
            {
                "AreaId": 2,
                "AreaName": "Hall",
                "Sequence": 1,
                "Data": [
                    {
                        "AssetId": 3,
                         Some OtherFields,
                    }
                ]
            }

]

我希望这个输出如下所述：

 "Todo": [
            {
                "AreaId": 4,
                "AreaName": "Hall",
                "Sequence": 3,
                "Data": [
                    {
                        "AssetId": 2,
                         Some OtherFields,
                    },
                    {
                        "AssetId": 3,
                        Some OtherFields,
                    }

                ]
            },




       {
            "AreaId": 2,
            "AreaName": "Hall",
            "Sequence": 3,
            "Data": [
                {
                    "AssetId": 4,
                     Some OtherFields,
                },
                {
                    "AssetId": 3,
                    Some OtherFields,
                }

            ]
        }
]

Answer 1

您可以使用reduce 合并对象：

我们在这里按 AreaId、AreaName 和 Sequence 进行分组，更准确地说，我们使用除 Data 之外的所有其他属性来对对象进行分组。

例如：

const data = { "Todo": [ { "AreaId": 4, "AreaName": "Hall", "Sequence": 3, "Data": [ { "AssetId": 2, "SomeOtherField1": "Value1", "SomeOtherField2": "Value2" } ] }, { "AreaId": 4, "AreaName": "Hall", "Sequence": 3, "Data": [ { "AssetId": 3, "SomeOtherField1": "Value1", "SomeOtherField2": "Value2" } ] }, { "AreaId": 2, "AreaName": "Hall", "Sequence": 1, "Data": [ { "AssetId": 4, "SomeOtherField1": "Value1", "SomeOtherField2": "Value2" } ] }, { "AreaId": 2, "AreaName": "Hall", "Sequence": 1, "Data": [ { "AssetId": 3, "SomeOtherField1": "Value1", "SomeOtherField2": "Value2" } ] } ] }; 

// Let's do a reduce here..
const result = { Todo: Object.values(data.Todo.reduce((acc, elem ) => {
    // Create a key based on AreaId
    const key = elem.AreaId;
    if (!acc[key]) { 
        acc[key] = { ...elem };
        acc[key].Data = [];
    }
    acc[key].Data = [...(acc[key].Data || []), elem.Data];
    return acc;
}, {}))};

console.log("Result:", result);