Mongodb - bad query: BadValue unknown top level operator: $gte

Question

What is wrong with this query? I tried to run it on mongodb server and received an error as following - \"exception: bad query: BadValue unknown top level operator: $gte\".

Answer 1

You need to include explicitly package in cmd prompt like npm i regex and change in service like as below:

const kidDetails = await this.studentModel.find({ name:{$regex: new RegExp('.*' + studName, 'i') }} );

Answer 2

Since MongoDB version 3.6, you may use $expr to use aggregate expressions within a query. So the query can be rewritten into:

db.scores.aggregate([
  {
    $match: {
      $expr: {
        $or: [
          { $gte: ["$score", 30] },
          { $lte: ["$score", 60] }
        ]
      }
    }
  },
  {
    $group: {
      _id: "$gamer",
      games: { $sum: 1 }
    }
  }
]);

Answer 3

You did this wrong. Should be:

db.scores.aggregate([
    { "$match": {
        "score": { "$gte": 30, "$lte": 60 }
    }},
    { "$group": {
        "_id": "$gamer",
        "games": { "$sum": 1 }
    }}
])

Which is the proper way to specify a "range" query where the actual conditions are "and" and therefore "between" the operands specified.