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I have a document with a field _id has type ObjectId, and a field created_at has type Date.
_id is of course increasing, and the value of created_at is current_date should be increasing.
So my question is :
A._id > B._id, but A.created_at < B.created_at.created_at as precise as possible, so the order of created_at corresponds to _id.
576
MongoDB can perform sort operations on a single-field index in ascending or descending order. In compound indexes, the sort order determines whether the index can be sorted. The sort keys must be listed in the same order as defined in the index.
by default mongo appears to return documents in insertion order. MongoDB returns documents in natural order when no sort order is specified.
you can use order_by on documents collection like
in Rails
Product.order_by("created_at desc")
in Mongodb for example
db.products.find().sort({"created_at": 1}) --- 1 for asc and -1 for desc
Mongoose creates timestamps with field name "createdAt" and "updatedAt"
db.products.find().sort({"createdAt": 1})
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