javascript - 当key有空格和点时如何在mongodb中查询

Question

您好，我的收藏中有这种类型的文档，其中有空间和点

{
        "_id" : ObjectId("5d7e3fd812674c2234ff1983"),
        "Emp. No" : "ABC",
        "Emp. Name" : "DEEPAK DAHIYA",
        "Card No" : "24700",
        "Department" : "TEst",
        "Att Date" : "06-Jun-2019",
        "In Time" : "06-Jun-2019 11:10",
        "Out Time" : "06-Jun-2019 16:42",
        "Status" : "P       ",
        "Late By " : "02:10",
        "Early By " : "01:18",
        "Total Hour" : "05:32",
        "OT Hour" : "00:00",
        "Location" : "Consolidated",
        "id" : "f1758761dd4f5295d9075173e83353af"
    }

现在我想使用聚合来聚合我的结果。但我的查询没有给出正确的输出，因为我的键中有空格和点

await Dance.aggregate([
  {
    $group: {
      _id: '$["Emp. No"]',
      data: {
        $addToSet: { attendance: "$['Att Date']", Status: "$Status", id: "$id" }
      }
    }
  },
  { $project: { '["Emp. No"]': "$_id", _id: 0, data: 1 } }
]);

已经尝试过方括号但不起作用。

更新的查询:

const result = await Dance.aggregate([
  {
    $group: {
      _id: "$Emp. No",
      data: {
        $addToSet: { attendance: "$Att Date", Status: "$Status", id: "$id" }
      }
    }
  },
  { $project: { "Emp. No": "$_id", _id: 0, data: 1 } }
]);

也无法正常工作

Answer 1

你can have fields with spaces以及fields with underscores - 你不能在字段中包含句点，例如:escaped query和 non-escaped query ..

现在，有一些警告......只要您使用 Mongo 3.6+ 并且只要字段包含句点 is not a top level field, and is the only 'nested' field ，它会起作用。如果您尝试使用多个嵌套字段，it will not work ..

您可以read more on the subject here ...

总而言之，您应该谨慎行事并删除句点，但您可以保留允许的空格。