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mongodb update field inside array

By #KMJ#KMJ on Dec 15, 2020 
Consider the following document in the students collection whose grades element value is an array of embedded documents:

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

Use the positional $ operator to update the std field of the first array element that matches the grade equal to 85 condition:

IMPORTANT
---------
You must include the array field as part of the query document.

db.students.updateOne(
   { _id: 4, "grades.grade": 85 },
   { $set: { "grades.$.std" : 6 } }
)
After the operation, the document has the following updated values:

{
   "_id" : 4,
   "grades" : [
      { "grade" : 80, "mean" : 75, "std" : 8 },
      { "grade" : 85, "mean" : 90, "std" : 6 },
      { "grade" : 85, "mean" : 85, "std" : 8 }
   ]
}

Source: docs.mongodb.com

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mongodb find and update array item by id

By florinreleaflorinrelea on May 28, 2021 
db.myCollection.update({"_id" : 1, "lb.id" : 2},{$set : {"lb.$.sc" : 17}})

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