Javascript 对象数组压缩为具有嵌套数组的唯一对象数组

我在MongoDB中有arr数据，需要将文档压缩成一个，以便在chartjs中显示数据

arr = [
    {
        "_id": "5d7baef782e09dc7f6b5be2d",
        "awaySpread": "3.0",
        "homeSpread": "-3.0",
        "homeTeam": "Tennessee Titans",
        "awayId": "4529605_261_sp",
        "awayTeam": "Indianapolis Colts",
        "homeId": "4529605_262_sp",
        "eventDate": "2019-09-15 13:00:00",
        "createdDate": "2019-09-13T13:00:06.527Z"
    },
    {
        "_id": "5d7baef782e09dc7f6b5be31",
        "awaySpread": "-19.5",
        "homeSpread": "19.5",
        "homeTeam": "Miami Dolphins",
        "awayId": "4529609_269_sp",
        "awayTeam": "New England Patriots",
        "homeId": "4529609_270_sp",
        "eventDate": "2019-09-15 13:00:00",
        "createdDate": "2019-09-13T13:00:06.527Z"
    },
    {
        "_id": "5d7baef782e09dc7f6b5be2d",
        "awaySpread": "2.5",
        "homeSpread": "-2.5",
        "homeTeam": "Tennessee Titans",
        "awayId": "4529605_261_sp",
        "awayTeam": "Indianapolis Colts",
        "homeId": "4529605_262_sp",
        "eventDate": "2019-09-15 13:00:00",
        "createdDate": "2019-09-13T13:30:06.527Z"
    }
]

希望进入：

newarr = [
    {
        "_id": "5d7baef782e09dc7f6b5be2d",
        "awaySpread": "3.0",
        "homeSpread": "-3.0",
        "homeTeam": "Tennessee Titans",
        "awayId": "4529605_261_sp",
        "awayTeam": "Indianapolis Colts",
        "homeId": "4529605_262_sp",
        "eventDate": "2019-09-15 13:00:00",
        "createdDate": "2019-09-13T13:00:06.527Z",
        "lines": {
           "spread": ["3.0","2.5"],
           "dates: : ["2019-09-13T13:00:06.527Z","2019-09-13T13:30:06.527Z"]
         },

    },
    {
        "_id": "5d7baef782e09dc7f6b5be31",
        "awaySpread": "-19.5",
        "homeSpread": "19.5",
        "homeTeam": "Miami Dolphins",
        "awayId": "4529609_269_sp",
        "awayTeam": "New England Patriots",
        "homeId": "4529609_270_sp",
        "eventDate": "2019-09-15 13:00:00"
        "createdDate": "2019-09-13T13:00:06.527Z",
        "lines": {
           "spread": ["-19.5"],
           "dates: : ["2019-09-13T13:00:06.527Z"]
         },
    }
]

我可以使用过滤器仅返回基于awayId的唯一对象，但我不确定使用过滤器是否允许我推送带有排列和日期的行。

我会使用该功能

我正在构建一个对象，其中id是键，值是对象。 当我已经在里面有了id（第二次遇到相同的id时），我将相关的值推到行中

最后，我将对象的值记录在控制台日志中，该对象是您想要的输出

arr = [
    {
        "_id": "5d7baef782e09dc7f6b5be2d",
        "awaySpread": "3.0",
        "homeSpread": "-3.0",
        "homeTeam": "Tennessee Titans",
        "awayId": "4529605_261_sp",
        "awayTeam": "Indianapolis Colts",
        "homeId": "4529605_262_sp",
        "eventDate": "2019-09-15 13:00:00"
    },
    {
        "_id": "5d7baef782e09dc7f6b5be31",
        "awaySpread": "-19.5",
        "homeSpread": "19.5",
        "homeTeam": "Miami Dolphins",
        "awayId": "4529609_269_sp",
        "awayTeam": "New England Patriots",
        "homeId": "4529609_270_sp",
        "eventDate": "2019-09-15 13:00:00"
    },
    {
        "_id": "5d7baef782e09dc7f6b5be2d",
        "awaySpread": "2.5",
        "homeSpread": "-2.5",
        "homeTeam": "Tennessee Titans",
        "awayId": "4529605_261_sp",
        "awayTeam": "Indianapolis Colts",
        "homeId": "4529605_262_sp",
        "eventDate": "2019-09-15 13:00:00"
    }
]

const newArr = arr.reduce((result, itr) => {
  if (result[itr.awayId]) {
    result[itr.awayId].lines.spread.push(itr.awaySpread)
    result[itr.awayId].lines.dates.push(itr.eventDate)
  } else {
    result[itr.awayId] = { ...itr, lines: { spread: [itr.awaySpread], dates: [itr.eventDate] }}
  }
  return result
}, {})

console.log(Object.values(newArr))

我会使用这个函数

我正在构建一个对象，其中id是键，值是对象。 当我已经在里面有了id（第二次遇到相同的id时），我将相关的值推到行中

最后，我将对象的值记录在控制台日志中，该对象是您想要的输出

arr = [
    {
        "_id": "5d7baef782e09dc7f6b5be2d",
        "awaySpread": "3.0",
        "homeSpread": "-3.0",
        "homeTeam": "Tennessee Titans",
        "awayId": "4529605_261_sp",
        "awayTeam": "Indianapolis Colts",
        "homeId": "4529605_262_sp",
        "eventDate": "2019-09-15 13:00:00"
    },
    {
        "_id": "5d7baef782e09dc7f6b5be31",
        "awaySpread": "-19.5",
        "homeSpread": "19.5",
        "homeTeam": "Miami Dolphins",
        "awayId": "4529609_269_sp",
        "awayTeam": "New England Patriots",
        "homeId": "4529609_270_sp",
        "eventDate": "2019-09-15 13:00:00"
    },
    {
        "_id": "5d7baef782e09dc7f6b5be2d",
        "awaySpread": "2.5",
        "homeSpread": "-2.5",
        "homeTeam": "Tennessee Titans",
        "awayId": "4529605_261_sp",
        "awayTeam": "Indianapolis Colts",
        "homeId": "4529605_262_sp",
        "eventDate": "2019-09-15 13:00:00"
    }
]

const newArr = arr.reduce((result, itr) => {
  if (result[itr.awayId]) {
    result[itr.awayId].lines.spread.push(itr.awaySpread)
    result[itr.awayId].lines.dates.push(itr.eventDate)
  } else {
    result[itr.awayId] = { ...itr, lines: { spread: [itr.awaySpread], dates: [itr.eventDate] }}
  }
  return result
}, {})

console.log(Object.values(newArr))

---

createdDate

s从何而来？在数据库中创建记录时，只需在SOcreatedDate上搜索“按属性分组对象数组”，为什么在输入

arr

中缺少它？抱歉，更新了代码

createdDate

s从何而来？只需搜索“按属性分组对象数组”在数据库中创建记录时，会设置on-SOcreatedDate，为什么输入中缺少它？抱歉，更新了代码谢谢，但这只嵌套了排列和日期，不会通过唯一的awayId进行压缩groupBy是根据

\u id

或

awayId

？awayId进行的，我在发表评论后意识到。谢谢你可以控制它：）gl谢谢，但这只是嵌套排列和日期，不通过唯一的awayId压缩groupBy是根据

\u id

或

awayId

？awayId，我在发表评论后意识到。谢谢您可以控制它：）GL