根据条件将 object 复制到另一个

Question

lets say I have this sample object like below,

let parentObj = {
  "SM": {
    "child_roles": {
      "SM#02": {
        "code": "SM#02",
        "assigned_info": [
          {
            "cur_assigned_to": "7486",
            "assigned_date": 1644483524,
            "assigned_fromdate": 1644517800,
            "assigned_todate": 1645122600,
          },
          {
            "cur_assigned_to": "3050",
            "assigned_date": 1656613800,
            "assigned_fromdate": 1658255400,
            "assigned_todate": 1659292200,
          }
        ]
      },
      "SM#03": {
        "code": "SM#03",
        "assigned_info": [
          {
            "cur_assigned_to": "7486",
            "assigned_date": 1644483638,
            "assigned_fromdate": 1644517800,
            "assigned_todate": 1645727400,
          },
          {
            "cur_assigned_to": "3050",
            "assigned_date": 1656613800,
            "assigned_fromdate": 1656613800,
            "assigned_todate": 1660069800,
          }
        ]
      },
      "SM#01": {
        "code": "SM#01",
        "assigned_info": []
      }
    }
  },
  "SMP": {
    "child_roles": {
      "SMP#01": {
        "code": "SMPR#01",
        "assigned_info": [
          {
            "cur_assigned_to": "7486",
            "assigned_date": 1644483672,
            "assigned_fromdate": 1644431400,
            "assigned_todate": 1645122600,
          }
        ]
      }
    }
  },
  "SMR": {
    "child_roles": {
      "SMR#01": {
        "code": "SMOR#01",
        "assigned_info": []
      },
      "SMOR#02": {
        "code": "SMOR#02",
        "assigned_info": []
      }
    }
  },
  "ANC": {
    "child_roles": {}
  }
}

Now there is a key named assigned_info, this is a collection of assignment information. I want to check if it contains an item whose cur_assigned_to = 3050 then copy that array item along with other properties of that object. Sorry for my bad English, in another word, I want to get this output like below,

let expectedObj = {
  "SM": {
    "child_roles": {
      "SM#02": {
        "code": "SM#02",
        "assigned_info": [
          {
            "cur_assigned_to": "3050",
            "assigned_date": 1656613800,
            "assigned_fromdate": 1658255400,
            "assigned_todate": 1659292200,
          }
        ]
      },
      "SM#03": {
        "code": "SM#03",
        "assigned_info": [
          {
            "cur_assigned_to": "3050",
            "assigned_date": 1656613800,
            "assigned_fromdate": 1656613800,
            "assigned_todate": 1660069800,
          }
        ]
      },
      "SM#01": {
        "code": "SM#01",
        "assigned_info": []
      }
    }
  },
  "SMP": {
    "child_roles": {
      "SMP#01": {
        "code": "SMPR#01",
        "assigned_info": [
        ]
      }
    }
  },
  "SMR": {
    "child_roles": {
      "SMR#01": {
        "code": "SMOR#01",
        "assigned_info": []
      },
      "SMOR#02": {
        "code": "SMOR#02",
        "assigned_info": []
      }
    }
  },
  "ANC": {
    "child_roles": {}
  }
}

What I have tried: I can loop through all the elements of that assigned_info array and check whether the cur_assigned_to is 3050, but I cannot able to copy the remaining keys and couldn't able to delete other array elements.

Answer 1

You can copy the entire parentObj and remove unexpected items in array.

let objCopy = JSON.parse(JSON.stringify(parentObj))
for (let i in objCopy) {
    for (let j in objCopy[i]['child_roles']) {
        let obj = objCopy[i]['child_roles'][j]['assigned_info']
        for (let k in obj) {
            if ('cur_assigned_to' in obj[k] && obj[k].cur_assigned_to != '3050') {
                obj.splice(k, 1)
            }
        }
    }
}