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I know that findOne is constant time when using it in the following way:

collection.findOne(aString)

However, I can't seem to find out if it's still constant time when querying an indexed field that isn't _id. For example, I have a collection that's mirroring an external API. In this collection, there's a separate id field that's indexed.

My question is, is collection.findOne({ id: anId }) still constant time?

Cereal
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2 Answers2

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Yes. From the minimongo documentation: "Internally, all documents are mapped in a single JS object from _id to the document. Besides this mapping, Minimongo doesn't implement any types of secondary indexes."

Source: https://github.com/meteor/meteor/tree/master/packages/minimongo

softwarerero
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There is only one index(primary) in minimongo and it is on _id

Ajay Rafalia
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  • It would be nice to add some explanation to the OP's question: *Is `collection.findOne({ id: anId ])` still constant time?* – colidyre Mar 19 '20 at 11:26