獲取 Mongoose UpdateMany 受影響文檔的計數

Question

假設我們有代碼：

 await Employees.updateMany(
        {
          InsertDate: {
            $gte: _yesterday,  // date ojbect that is passed as a param
            $lte: _today  // date ojbect that is passed as a param
          }
        },
        { $set: { RegistrationDate: ... // some var that I generate } }
      );

我們怎樣才能得到受影響文件的數量（計數）？

Answer 1

由於在記錄文檔，你可以得到響應的更新文件的數量nModified字段。

所以你可以像這樣訪問它：

const response = await Employees.updateMany(
  {
    InsertDate: {
      $gte: _yesterday,  // date ojbect that is passed as a param
      $lte: _today  // date ojbect that is passed as a param
    }
  },
  { $set: { RegistrationDate: ... // some var that I generate } }
);

console.log("Number of updated documents: ", response.nModified);

Answer 2

如果您使用的是 MongoDB 版本 >= 5.0，則使用modifiedCount而不是nModified

例如

const response = await Employees.updateMany(
  {
    InsertDate: {
      $gte: _yesterday,  // date ojbect that is passed as a param
      $lte: _today  // date ojbect that is passed as a param
    }
  },
  { $set: { RegistrationDate: ... // some var that I generate } }
);

console.log("Number of updated documents: ", response.modifiedCount);