Question

我试图使用bluebird + mongoose分别查询每个俱乐部的DevHiin实例，如下面的代码：

DevHiin.clubs的数据结构是：

  , clubs  : [{ type: Schema.Types.ObjectId, ref: 'Club' }]

和club_M是俱乐部模式的一个实例：

  User.findOne({"_id": req.user._id})
    .populate('clubs', '-textIndex')
    .exec(function (err, user) {
    if (err) res.status(500).json(err);

    if (user.clubs) {
      var clubs_M = user.clubs;


    for (c = 0; c < clubs_M.length; c++) {
        var club_M = clubs_M[c];

        if (club_M.lst > lstDate) {

          serverData.clubs.push(club_M);

          var ciinPromise = DevHiin.find({"clubs": {$elemMatch: club_M}, "ts": {"$gt": lastSyncTime}})
            .populate('uId', '_id username', null, null)        // get necessary user info for a hiin
            .lean()
            .sort("ts")
            .limit(10)
            .execAsync();
          promises.push(ciinPromise);
        }
      }

      Promise.all(promises).then(function (ciinArrays) {
        serverData.ciinArrays = ciinArrays;
        callback(ciinArrays);

      }).catch(function (err) {
        callback(err);
      });

不幸的是，我收到了以下错误信息：

"Error: Can't use $__ with Array.
at SchemaArray.castForQuery (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/schema/array.js:188:13)
at SchemaArray.cast$elemMatch (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/schema/array.js:336:23)
at SchemaArray.castForQuery (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/schema/array.js:191:19)
at module.exports (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/cast.js:196:39)
at Query.cast (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/query.js:2350:10)
at Query.find (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/query.js:999:10)
at Query.exec (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/query.js:1984:17)
at Query.tryCatcher (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/bluebird/js/main/util.js:24:31)
at Query.ret [as execAsync] (eval at <anonymous> (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/bluebird/js/main/promisify.js:1:0), <anonymous>:12:23)
at EventEmitter.<anonymous> (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/controllers/sync.js:189:18)
at EventEmitter.<anonymous> (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/node_modules/mpromise/lib/promise.js:175:45)
at emitOne (events.js:77:13)
at EventEmitter.emit (events.js:169:7)
at Promise.safeEmit (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/node_modules/mpromise/lib/promise.js:81:21)
at Promise.fulfill (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/node_modules/mpromise/lib/promise.js:94:24)
at Promise.resolve (/Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/promise.js:113:23)
at /Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/lib/query.js:1174:16
at /Users/vince-fan/WorkSpaces/MEAN/V_Starter/node_modules/mongoose/node_modules/kareem/index.js:109:16
at doNTCallback0 (node.js:408:9)
at process._tickCallback (node.js:337:13)"

这是蓝鸟承诺错误还是猫鼬错误？我该如何解决？

Answer 1

从代码中看起来，您尝试使用 $elemMatch 对指定为查询条件表达式的数组值进行查询。我相信你需要使用 $in ，这会选择club_M字段的值等于指定数组中任何值的文档，该数据由变量存储在你的情况下var ciinPromise = DevHiin.find({"clubs": {"$in": [club_M._id]}, "ts": {"$gt": lastSyncTime}})。因此，您的查询应如下所示：

oBook.Worksheets(1).Range("$D$1:$D$4000").AutoFilter(Field:=4, Criteria:="#N/A")

Answer 2

for querying field包含一个数组，简单地将其视为普通字段查询。

我的固定代码：

FileInputStream file = new FileInputStream(new File("C:\\testdata.xls")); 
  HSSFWorkbook workbook = new HSSFWorkbook(file);

  HSSFSheet sheet = workbook.getSheetAt(0);

for (int i=1; i <= sheet.getLastRowNum(); i++){

        String keyword = sheet.getRow(i).getCell(0).getStringCellValue();

        searchbox.sendKeys(keyword);

        searchbox.submit();       

        driver.manage().timeouts().implicitlyWait(10000, TimeUnit.MILLISECONDS);

}

  workbook.close();
  file.close();

bluebird + mongoose错误：“不能将$ __与Array一起使用。”

2 个答案: