Mastering MongoDB 4.x - Second Edition

Updating documents

In the following code block, you can see an example of updating a single document using the update_one helper method.

This operation matches one document in the search phase and modifies one document based on the operation to be applied to the matched documents:

>>> result = books.update_one({"isbn": "101"}, {"$set": {"price": 100}})>>> print(result.matched_count)1>>> print(result.modified_count)1

In a similar way to inserting documents, when updating documents, we can use update_one or update_many:

• The first argument here is the filter document for matching the documents that will be updated
• The second argument is the operation to be applied to the matched documents
• The third (optional) argument is to use upsert=false ...