Lodash：使用Lodash对json对象进行分组和重组

问题描述：

如何使用lodash对json对象进行分组和重组。有这样Lodash：使用Lodash对json对象进行分组和重组

var data = [ 
    { 
    "Type": "W", 
    "Id": 1, 
    "Employee_Role_Desc": null, 
    "Employee_Role_Id": 1, 
    "StartDateTime": "2017-06-15T09:00:00", 
    "EndDateTime": "2017-06-15T12:30:00", 
    "Alert": null 
    }, 
    { 
    "Type": "W", 
    "Id": 1, 
    "Employee_Role_Desc": null, 
    "Employee_Role_Id": 1, 
    "StartDateTime": "2017-06-15T09:00:00", 
    "EndDateTime": "2017-06-15T12:30:00", 
    "Alert": null 
    }, { 
    "Type": "W", 
    "Id": 1, 
    "Employee_Role_Desc": null, 
    "Employee_Role_Id": 3, 
    "StartDateTime": "2017-06-15T09:00:00", 
    "EndDateTime": "2017-06-15T12:30:00", 
    "Alert": null 
    } 
]

JSON对象要像这组吨。

{ 
      "Role_Id": 1, 
      "Date": "2017-06-15T05:12:22.9577063-05:00", 
      "**Blocks**": [ 
      { 
       "StartDateTime": "2017-06-15T05:12:22.9586499-05:00", 
       "EndDateTime": "2017-06-15T05:12:22.9586499-05:00" 
      }, 
      { 
       "StartDateTime": "2017-06-15T05:12:22.9586499-05:00", 
       "EndDateTime": "2017-06-15T05:12:22.9586499-05:00" 
      } 
      ] 
     }

集团它由Employee_Role_Id并且每个的startDateTime和EndDateTime应在结果的块对象 “ROLE_ID”应是“Employee_Role_Id”中得到的对象。

应该用' “Employee_Role_Id” 的项目：3'被忽略？ – RomanPerekhrest

@RomanPerekhrest No.还需要 – Aswathy

纯JS解决方案如何？ – RomanPerekhrest

答

可以实现在一个链使用_.groupBy()和_.map()：

const data = [{"Type":"W","Id":1,"Employee_Role_Desc":null,"Employee_Role_Id":1,"StartDateTime":"2017-06-15T09:00:00","EndDateTime":"2017-06-15T12:30:00","Alert":null},{"Type":"W","Id":1,"Employee_Role_Desc":null,"Employee_Role_Id":1,"StartDateTime":"2017-06-15T09:00:00","EndDateTime":"2017-06-15T12:30:00","Alert":null},{"Type":"W","Id":1,"Employee_Role_Desc":null,"Employee_Role_Id":3,"StartDateTime":"2017-06-15T09:00:00","EndDateTime":"2017-06-15T12:30:00","Alert":null}]; 
 

 
const result = _(data) 
 
    .groupBy('Employee_Role_Id') // group the items 
 
    .map((group, Role_Id) => ({ // map the groups to new objects 
 
    Role_Id, 
 
    Date: group[0].StartDateTime, 
 
    Blocks: group.map(({ StartDateTime, EndDateTime }) => ({ // extract the dates from the groups 
 
     StartDateTime, 
 
     EndDateTime 
 
    })) 
 
    })) 
 
    .value(); 
 

 
console.log(result);

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Lodash：使用Lodash对json对象进行分组和重组

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