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Asked: 2026-06-18T16:43:28+00:00

I’m using casbah in Scala to do inserts into MongoDB and not understanding some

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I’m using casbah in Scala to do inserts into MongoDB and not understanding some behavior I’m seeing.

val wr = dao.collection.insert(myRecord, dao.defaultWriteConcern)
val error = wr.getCachedLastError

Ok, nothing fancy here. In fact if I insert a document it works great. My problem is if I go and insert the same document again then my error == null, where I would expect some kind of indication I’m trying to insert a record that already exists.

Is this because my defaultWriteConcern is too “loose”, or am I just not understanding the correct behavior? I’m using casbah 2.5.0.SNAPSHOT. I was using an older version and I seem to remember it gave me some kind of an error, which is what I would expect.

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1 Answer

  1. Editorial Team

    You won’t receive an error creating a record with duplicate content unless you’re violating a unique index with a field that is duplicated.

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