Hitting assert "update object must consist of $-prefixed modifiers" in mongo-cxx-driver/src/mongo/client/bulk_update_builder.cpp

[Sumanta Dutta]

Hi,

We use MongoDB C++ driver v1.1.0 and DB v3.2.11. 

I am trying to bulk update entire document using find(key).updateOne(replacementDoc). 

The replacementDoc doesn't have _id field as per documentation https://docs.mongodb.com/manual/reference/method/Bulk.find.updateOne/. 

I am getting the following error -

  Exception of type "mongo::UserException"

  Message: update object must consist of $-prefixed modifiers

Any idea why it's expecting $-prefixed modifiers? I didn't want to use $set as some of the fields may not be present in the replacementDoc. 

In which case, those fields should be absent in the updated document. So it's better to replace the entire document.

Thanks,

Sumanta

[David Golden]

Hi.

If you're replacing the entire document, you need to use "replaceOne", not "updateOne".

Regards,

David

[Sumanta Dutta]

David, let me give that a try. But why does the MongoDB documentation link has 'Replace a Document' section for updateOne? 

Thanks,

Sumanta

[David Golden]

I don't know.  Maybe it's a doc rendering bug.  Can you give me a link to the exact page you're seeing that?

Thanks,

David

[Sumanta Dutta]

David, the link is my original post. BTW, replaceOne worked as expected.

Thanks,

Sumanta

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[David Golden]

That's shell documentation, so I don't know, but I'll open a ticket about it.