mongodb update queries

db.post.update({ _id: ObjectId("634940d222dc636741bd70d4") }, {

    $set: {

        "title": "MongoDB Overview",

        "description": "MongoDB is no SQL database",

        "by": "tutorials point",

        "url": "http://www.tutorialspoint.com",

        "tags": ["mongodb", "database", "NoSQL"],

        "likes": 99

    }

})



{
  _id: 4,
  grades: [
     { grade: 80, mean: 75, std: 8 },
     { grade: 85, mean: 90, std: 5 },
     { grade: 85, mean: 85, std: 8 }
  ]
}

Update Documents in an Array

db.students.updateOne(
   { _id: 4, "grades.grade": 85 },
   { $set: { "grades.$.std" : 6 } }
)

Update Embedded Documents Using Multiple Field Matches

db.students.updateOne(
   {
     _id: 5,
     grades: { $elemMatch: { grade: { $lte: 90 }, mean: { $gt: 80 } } }
   },
   { $set: { "grades.$.std" : 6 } }
)

Update with Multiple Array Matches

db.students_deans_list.updateOne(
   { activity_ids: 1, grades: 95, deans_list: 2021 },
   { $set: { "deans_list.$": 2022 } }
)