使用Lodash MapReduce更新集合的集合

Question

I have following collection which i need to send it to datatable and it won't accept collection of collection. So i need to flatten my structure and trying with lodash without much success.

My initial collection

 { "campaigns": [ { "name": "1st Campaign", "campaignType": "Test Campaign", "startDate": "2019/04/03", "endDate": "2019/04/30", "price": 1, "books": [ { "title": "\\"If They Move . . . Kill 'Em!\\"", "bookdata": { "batch": 2 } }, { "title": "!Click Song", "bookdata": { "batch": null } } ] }, { "name": "2nd cam", "campaignType": "test type", "startDate": "2019/04/10", "endDate": "2019/04/10", "price": 2.99, "retailers": null, "comments": null, "books": [ { "title": "\\"Johnny, We Hardly Knew Ye\\"", "bookdata": { "batch": null } }, { "title": "'A Very Fine Commander'", "bookdata": { "batch": 2 } } ] } ] } 

For each campaign i need structure like following where books title is comma separated for each books under campaign

  { "campaigns": [ { "name": "1st Campaign", "campaignType": "Test Campaign", "startDate": "2019/04/03", "endDate": "2019/04/30", "price": 1, "booksname": "\\"If They Move . . . Kill 'Em!\\"","!Click Song" "books": [ { "title": "\\"If They Move . . . Kill 'Em!\\"", "bookdata": { "batch": 2 } }, { "title": "!Click Song", "bookdata": { "batch": null } } ] }, { "name": "2nd cam", "campaignType": "test type", "startDate": "2019/04/10", "endDate": "2019/04/10", "price": 2.99, "retailers": null, "comments": null, "books": [ { "title": "\\"Johnny, We Hardly Knew Ye\\"", "bookdata": { "batch": null } }, { "title": "'A Very Fine Commander'", "bookdata": { "batch": 2 } } ] } ] } 

Answer 1

I was able to do it using

                        data.campaigns.map((item) => {
                            item.Booksname = _.map(item.books, 'title').join(',');
                        })