Is there a way to update a specific index in an array within a mongoDB document using a variable?
{
_id: 'IDString',
field: [ bla, bla, old, bla ];
}
let i = 2;
Collection.update(
{ _id: 'IDString' },
{ $set:
{ 'field.$.i': 'new' }
}
);
This should result in:
{
_id: 'IDString',
field: [ bla, bla, new, bla ];
}
I attempted to incorporate the variable i, but my code did not produce the desired outcome.
To efficiently update an element of an array using the dot notation syntax, concatenate the array name with the zero-based index position enclosed in quotes. This dynamic approach allows you to set up your update document accurately.
For instance, if we consider a scenario where you need to update the third element of an array named "field", the update document would look like this:
var update = { "$set": { "field.2": "new" } }
The code below demonstrates how to achieve this dynamically:
var i = 2,
update = { "$set": {} };
update["$set"]["field."+i] = "new";
db.collection.update({ "_id": "IDString" }, update)
Updating a collection with MongoDB:
Collection.update(
{ _id: 'IDString', field.2 : 1 },
{ $set: {
"field.$" : "new value" }
}
)
If you encounter any issues, please leave a comment.
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