小编Man*_* In的帖子

有两个集合：

销售量

{
  "_id" : ObjectId("5ba0bfb8d1acdc0de716e839"),
  "invoiceNumber" : 1,
  "saleDate" : ISODate("2018-09-01T00:00:00.000Z"),
  "totalTaxAmount" : 613,
  "subTotalAmount" : 2000,
  "totalAmount" : 2613,
  "balance" : 2613,
  "financialYear" : "2018-2019",
  "modeOfPayment" : "Digital Transfer",
  "customerName": "Acme Inc"
}

交易

{
  "_id" : ObjectId("5bbb4e131fb8af0dc645212d"),
  "transactionNumber" : 1    
  "transactionDate" : ISODate("2018-09-03T00:00:00.000Z"),
  "transactionType" : "Income",
  "partyName" : "Acme Inc",
  "transactionMode" : "Digital Transfer",
  "amount" : 2613,
  "paidItems" : [ 
      {
          "orderId" : "5b90a7d62bb5a21be4ff97e3",
          "invoiceNumber" : "1",
          "orderType" : "sale",
          "totalAmount" : 2613,
          "balance" : 613,
          "payingAmount" …