I need to maintain an array of objects in MondoDB with only 5 elements, if another element is to be added, the first one is deleted and the new one is added, but always only 5 elements. Is there any way to do this?
I'm using Express and MongoDB, this is part of my model where I need to keep the array with only 5 objects:
lastModificationBy: [{
uid:{
type: String,
required:true
},
username:{
type: String,
required:true
},
date:{
type: Number,
required:true
}
}],
To push each element in the array I use the following:
let product = await Product.findByIdAndUpdate( id,
{
$set: data,
$push: { 'lastModificationBy': lastModification }
}
);
Thanks!
You are using Mongoose and not Mongodb native driver.
Please try and let me know if below works. I dont have access to MongoDB so could not test
let product = await Product.findByIdAndUpdate(id, {
$set: data,
$push: {
'lastModificationBy': {
$each: [lastModification],
$slice: -5
}
}
);