在res.send期間JS對象發生了變化

Question

我在使用Express在RESTful API中發送對象時遇到了一些麻煩。這應該很簡單，但我有一個奇怪的錯誤。 這裏是我的代碼：

result = result.map(function (elem) { 
    elem.progress = elem.progress.map(prog => prog.progress).reduce((x, y) => x + y, 0); 
    return ({'user': elem}); 
}); 
result.forEach((elem) => console.log('#', elem.user.progress)); 
console.log('result:', result); 
res.send(result); 

這是我用它來測試它的數據：

[ 
    { 
    "user": { 
     "user_id": 1, 
     "id": 354, 
     "already_connected": 1, 
     "progress": [ 
     { 
      "id": 520, 
      "teams_user_id": 354, 
      "a_category_id": 1, 
      "progress": 100, 
      "created": "2016-11-10T13:44:30.000Z", 
      "modified": "2016-11-10T13:44:33.000Z" 
     }, 
     { 
      "id": 521, 
      "teams_user_id": 354, 
      "a_category_id": 2, 
      "progress": 100, 
      "created": "2016-11-10T13:44:33.000Z", 
      "modified": "2016-11-10T13:44:35.000Z" 
     }, 
     ], 
     "user": { 
     "name": "Foo bar", 
     "avatar_id": 6673, 
     "default_avatar_int": 1 
     } 
    } 
    } 
] 

我希望進步等於200，這是這樣，當我做的console.log在res.send之前，但是當我在Postman中收到數據時，進度仍然等於一個數組。我究竟做錯了什麼 ？

Answer 1

如果這是您最初使用的數據，那麼您可能忘記導航到.user屬性。檢查：

var result = [ 
 
    { 
 
    "user": { 
 
     "user_id": 1, 
 
     "id": 354, 
 
     "already_connected": 1, 
 
     "progress": [ 
 
     { 
 
      "id": 520, 
 
      "teams_user_id": 354, 
 
      "a_category_id": 1, 
 
      "progress": 100, 
 
      "created": "2016-11-10T13:44:30.000Z", 
 
      "modified": "2016-11-10T13:44:33.000Z" 
 
     }, 
 
     { 
 
      "id": 521, 
 
      "teams_user_id": 354, 
 
      "a_category_id": 2, 
 
      "progress": 100, 
 
      "created": "2016-11-10T13:44:33.000Z", 
 
      "modified": "2016-11-10T13:44:35.000Z" 
 
     }, 
 
     ], 
 
     "user": { 
 
     "name": "Foo bar", 
 
     "avatar_id": 6673, 
 
     "default_avatar_int": 1 
 
     } 
 
    } 
 
    } 
 
] 
 

 
result = result.map(function (elem) { 
 
    // you forgot to navigate to `.user` property 
 
    elem.progress = elem.user.progress.map(prog => prog.progress).reduce((x, y) => x + y, 0); 
 
    return ({'user': elem}); 
 
}); 
 
result.forEach((elem) => console.log('#', elem.user.progress)); 
 
console.log('result:', result);