使用forEach（）添加一個數組到一個對象（）

Question

我試圖使用forEach循環和數組[鍵] .transactions添加對象添加對象（事務）數組到數組（票據）。 我也嘗試使用推，但沒有工作。

一些幫助將是可愛的。

var bills = [{ 
    "_id": "5499aece1d7be6c6a3000001", 
    "billName": "Insurance", 
    "startDate": "2014-12-15T00:00:00.000Z", 
    "amount": 2400, 
    "type": 4, 
    "timestamp": "2014-12-23T18:05:02.987Z", 
    "__v": 0 
}, { 
    "_id": "549bf0597886c3763e000001", 
    "billName": "Leasing", 
    "startDate": "2014-12-25T00:00:00.000Z", 
    "endDate": "2017-10-14T22:00:00.000Z", 
    "amount": 16500, 
    "type": 4, 
    "timestamp": "2014-12-25T11:09:13.957Z", 
    "__v": 0 
}]; 

var transactions = [{ 
    "_id": "549ea8c957b654ef64000003", 
    "billId": "5499aece1d7be6c6a3000001", 
    "paymentDate": "2014-12-27T12:40:41.311Z", 
    "amount": 2400, 
    "timestamp": "2014-12-27T12:40:41.311Z", 
    "__v": 0 
}, { 
    "_id": "549ea8e632ed3f6265000001", 
    "billId": "549bf0597886c3763e000001", 
    "paymentDate": "2014-12-27T12:41:10.582Z", 
    "amount": 16500, 
    "timestamp": "2014-12-27T12:41:10.582Z", 
    "__v": 0 
}, { 
    "_id": "549ea93452ebbd8366000001", 
    "billId": "549bf0597886c3763e000001", 
    "paymentDate": "2014-12-27T12:42:28.744Z", 
    "amount": 16500, 
    "timestamp": "2014-12-27T12:42:28.745Z", 
    "__v": 0 
}]; 

和

var test = []; 
bills.forEach(function (bill, key) { 
    test.push(bill); 
    transactions.forEach(function (transaction) { 
     if (transaction.billId == bill._id) test[key].transactions = transaction; 
    }); 
}); 

console.log(test); 

最終結果應當是測試對象將攜帶各紙幣的對象內部的紙幣加上交易作爲對象陣列。

編輯

的問題是，這種代碼在的jsfiddle但是當我應用到陣列從貓鼬發現（）正在添加不起作用。 下面是完整的代碼：

app.get('/getbills', function(req,res) { 

    //get all bills 
    allBills = Bills.find().exec(); 

    //get all transactions 
    allTransactions = Transactions.find().exec(); 

    //aggregate bills and transactions in a promise 
    promise.all([allBills, allTransactions]).then(function(results){ 

     var bills = results[0]; 
     var transactions = results[1]; 
     var test = []; 
     // var test.transactions = []; 

     bills.forEach(function(bill, key) { 
      bill.transactions = transactions.filter(function (transaction) { 
       return transaction.billId === bill._id; 
     }); 
      console.log(bill.transactions); 
      test.push(bill); 
     }); 

     console.log(transactions); 
     res.send(test); 
    }); 


}); 

此，返回此：

[{"_id":"5499aece1d7be6c6a3000001","billName":"Jeep Insurance","startDate":"2014-12-15T00:00:00.000Z","amount":2400,"type":4,"timestamp":"2014-12-23T18:05:02.987Z","__v":0},{"_id":"549bf0597886c3763e000001","billName":"Leasing","startDate":"2014-12-25T00:00:00.000Z","endDate":"2017-10-14T22:00:00.000Z","amount":16500,"type":4,"timestamp":"2014-12-25T11:09:13.957Z","__v":0},{"_id":"54a014bfac01ca3526000001","billName":"Test","startDate":"2014-10-28T00:00:00.000Z","endDate":"2017-12-19T23:00:00.000Z","amount":1000,"type":4,"timestamp":"2014-12-28T14:33:35.233Z","__v":0}] 

我是歡迎您！

Answer 1

試試這個

bills.forEach(function(bill, key) { 
    bill.transactions = transactions.filter(function (el) { 
    return el.billId === bill._id; 
    }); 
}); 

console.log(bills); 

演示：http://jsbin.com/bocasi/5/edit?js,console

jQuery的版本

$.each(bills, function(i, bill) { 
    bill.transactions = $.grep(transactions, function (el) { 
    return el.billId === bill._id; 
    }); 
}); 

console.log(bills); 

演示：http://jsbin.com/bocasi/4/edit?js,console

更新：

app.get('/getbills', function(req, res) { 

    var allBills  = Bills.find().lean().exec(); 
    var allTransactions = Transactions.find().lean().exec(); 

    promise.all([allBills, allTransactions]).then(function(results) { 

     var bills  = results[0]; 
     var transactions = results[1]; 
     var test   = []; 

     bills.forEach(function(bill, key) { 
      bill.transactions = transactions.filter(function(transaction) { 
       return transaction.billId === bill._id; 
      }); 
     }); 

     res.send(bills); 
    }); 
}); 

Answer 2

是這樣的？

$.each(bills, function(index, bill){ 
    var arr_temp = []; 
    $.each(transactions, function(index, transaction){ 
     if(bill._id == transaction.billId){ 
      arr_temp.push(transaction); 
     } 
    }); 
    bill.transactions = arr_temp; 
}); 

console.log(bills); 

http://jsfiddle.net/8c7a89s2/1/

Answer 3

只需修改該法案直接對象。 （你這樣做反正）

bills.forEach(function (bill) { 
    bill.transactions = transactions.filter(function (transaction) { 
     return transaction.billId === bill._id; 
    }); 
}); 

隨着你的編輯（並沒有能夠測試），我覺得它應該是這樣的：

app.get('/getbills', function (req, res) { 
    var allBills = Bills.find().exec(); 
    var allTransactions = Transactions.find().exec(); 

    promise.all([allBills, allTransactions]).then(function (results) { 
     var bills = results[0]; 
     var transactions = results[1]; 

     bills.forEach(function (bill) { 
      bill.transactions = transactions.filter(function (transaction) { 
       return transaction.billId === bill._id; 
      }); 
     }); 
     res.send(bills); 
    }); 
});