Question: is Find(...).Limit(1).One(...) equivalent to Find(...).One(...)

[JordanP]

Hi,
I tried to answer that question myself but I can't figure out the code exactly. Do you happen to know the answer ?

Thanks !

[domodwyer]

Hi @JordanP

Yes it is the same - check https://github.com/globalsign/mgo/blob/master/session.go#L3391

Calling One() runs a findCmd with a limit of 1 the same as if you called Limit(1):

expectFindReply := prepareFindOp(socket, &op, 1)

func prepareFindOp(socket *mongoSocket, op *queryOp, limit int32) bool {
	// <snip>

	find := findCmd{
		// <snip>

		Limit: limit,
	}
	
	// <snip>
}

[JordanP]

Thank you !