dbproductsupdateOne

dbproductsupdateOne refers to the MongoDB shell method for updating a single document in a collection, such as products, that matches a given filter. It is used when you want to apply changes only to one matching document and maintain atomicity at the document level.

Syntax and parameters: The operation is invoked as db.collection.updateOne(filter, update, options). The filter is a query document that selects the target document. The update document specifies the changes to apply, typically using update operators like $set, $inc, or $unset; if the update document does not use any update operators, the document will replace the matched document. The options parameter is optional and can include upsert (to insert a new document if no match is found), writeConcern, bypassDocumentValidation, collation, and arrayFilters (for updates with array fields).

Behavior and results: updateOne updates at most one document that matches the filter. If multiple documents match, only one is updated. When update operators are used, only the specified fields are changed. If a plain replacement document is provided, the matched document is replaced entirely. If upsert is true and no document matches, MongoDB inserts a new document created from the combination of the filter and the update specification, depending on the update form used. The operation returns an UpdateResult, including matchedCount, modifiedCount, and upsertedId if an upsert occurred.

Examples: Updating a price with $set: db.products.updateOne({ item: "jacket" }, { $set: { price: 19.99 } }). Upserting: db.products.updateOne({ item: "scarf" }, { $set: { price: 5.99 } }, { upsert: true }).

See also: updateMany, replaceOne, findOneAndUpdate, bulkWrite.