Which method in MongoDB is used to replace a single document?

The method used in MongoDB to replace a single document is replaceOne(). This method directly addresses the need to replace an entire document within a collection based on a specified filter.

When you use replaceOne(), you provide it with two key components: a filter that matches the document you want to replace, and the new document that should take the place of the matched document. This operation completely replaces the existing document, meaning that all fields in the original document are removed and replaced with the fields of the new document, except for the _id field, which remains unchanged.

This method is particularly useful when you want to ensure that a document is fully updated without leaving behind any old fields or values. In contrast to other methods, such as updateOne(), which can modify specific fields of a document rather than the whole document, replaceOne() is specific in its functionality to handle complete document replacements cleanly.

Other options presented do not serve the purpose of replacing a single document. For instance, updateOne() allows for partial updates to existing documents by specifying which fields should be modified, while deleteOne() is used to remove documents entirely from a collection. insertOne(), on the other hand, is intended