For instance, consider a scenario in which I have a collection of Users. Some users have an age field and some do not. Here is an illustration:
userA: {
age: 10
}
userB: {
age: null
}
userC: {
age: 20
}
I am interested in updating all users without an age value to {age: 15}, followed by sorting based on the age field. The expected result of this operation would be: [userA, userB, userC]. Is there a way to achieve this?
If you want to assign a default value, consider using the $ifNull operator:
db.collection.aggregate([
{
$addFields: {
age: { $ifNull: [ "$age", 15 ] }
}
},
{
$sort: { age: 1 }
}
])
Check out this example on Mongo Playground
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