MongoDB Find & Update A Sub-doc Without Replacing Adjacent Data

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Perhaps I’m mis-reading the Mongo docs but it should be possible to find and update a MongoDB subfield without wiping adjacent fields using dot notation. Otherwise, I have to update the entire sub-doc so nothing gets deleted. Am I missing something about how n8n implements Mongo?

When I execute the workflow below, the existing data in “users” gets replaced with the updated “city”.

Information on your n8n setup

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Interestingly, if I disable “Use Dot Notation” in the updating MongoDB node, the “city” field is saved correctly without wiping the adjacent data but it’s value is null.

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