javascript - 如何使用纯 Javascript (ES6) 按 id 合并两个 json 对象值

Question

我有两个 Javascript 对象数组，我想将两个具有相同“ObjID”的 Javascript 对象的属性合并到一个 Javascript 对象中。

例如:

// Array of Javascript Objects 1:
let request1 = [{"ObjId":174864,"ObjMutationD":"2010-07-09T00:00:00.000Z","ObjMitarbeiterS":"epf","ObjAufId":142},
{"ObjId":175999,"ObjMutationD":"2010-07-09T00:00:00.000Z","ObjMitarbeiterS":"epf","ObjAufId":149}]

// Array of Javascript Objects 2:
let request2 = [{"ObjId":174864,"MulPfadS":"M:\\Originalbilder\\FGS\\95nn","MulDateiS":"9576.305-034-1","MulExtentS":"jpg"},
{"ObjId":177791,"MulPfadS":"M:\\Originalbilder\\FGS\\95nn","MulDateiS":"9576.305-035-1","MulExtentS":"jpg"}]

合并到一个具有相同 ObjId 值的 Javascript 对象(参见 ObjID:174864)，其余(对象)保持不变:

let result = [{"ObjId":174864,"ObjMutationD":"2010-07-09T00:00:00.000Z","ObjMitarbeiterS":"epf","ObjAufId":142,
"MulPfadS":"M:\\Originalbilder\\FGS\\95nn","MulDateiS":"9576.305-034-1","MulExtentS":"jpg"},
{"ObjId":175999,"ObjMutationD":"2010-07-09T00:00:00.000Z","ObjMitarbeiterS":"epf","ObjAufId":149},
{"ObjId":177791,"MulPfadS":"M:\\Originalbilder\\FGS\\95nn","MulDateiS":"9576.305-035-1","MulExtentS":"jpg"}]

到目前为止我尝试了什么:

let request1 = [{"ObjId":174864,"ObjMutationD":"2010-07-09T00:00:00.000Z","ObjMitarbeiterS":"epf","ObjAufId":142},
{"ObjId":175999,"ObjMutationD":"2010-07-09T00:00:00.000Z","ObjMitarbeiterS":"epf","ObjAufId":149}]

let request2 = [{"ObjId":174864,"MulPfadS":"M:\\Originalbilder\\FGS\\95nn","MulDateiS":"9576.305-034-1","MulExtentS":"jpg"},
{"ObjId":177791,"MulPfadS":"M:\\Originalbilder\\FGS\\95nn","MulDateiS":"9576.305-035-1","MulExtentS":"jpg"}]

function joinObjects() {
  var idMap = {};
  for(let i = 0; i < arguments.length; i++) {
    for(let j = 0; j < arguments[i].length; j++) {
       let currentID = arguments[i][j]['ObjId'];
       if(!idMap[currentID]) {
          idMap[currentID] = {};
        }
       // Iterate over properties of objects in arrays
      for(key in arguments[i][j]) {
          idMap[currentID][key] = arguments[i][j][key];
      }
    }
  }

  // push properties of idMap into an array
  let newArray = [];
  for(property in idMap) {
    newArray.push(idMap[property]);
  }
  return newArray;
}

let result = joinObjects(request1, request2);

Answer 1

你可以使用 Map和 Object.assign用于合并对象。

var request1 = [{
    ObjId: 174864,
    ObjMutationD: "2010-07-09T00:00:00.000Z",
    ObjMitarbeiterS: "epf",
    ObjAufId: 142
  }, {
    ObjId: 175999,
    ObjMutationD: "2010-07-09T00:00:00.000Z",
    ObjMitarbeiterS: "epf",
    ObjAufId: 149
  }],
  request2 = [{
    ObjId: 174864,
    MulPfadS: "M:\\Originalbilder\\FGS\\95nn",
    MulDateiS: "9576.305-034-1",
    MulExtentS: "jpg"
  }, {
    ObjId: 177791,
    MulPfadS: "M:\\Originalbilder\\FGS\\95nn",
    MulDateiS: "9576.305-035-1",
    MulExtentS: "jpg"
  }];

var result = [...[request1, request2].reduce((m, a) => (a.forEach(o => m.has(o.ObjId) && Object.assign(m.get(o.ObjId), o) || m.set(o.ObjId, o)), m), new Map).values()];

console.log(result);

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