MongoDB
MongoDB primary keys
MongoDB
MongoDB primary keys
How Bracket treats MongoDB primary keys
Summary
Bracket uses MongoDB ObjectId values to uniquely map each document to the opposing data source. The user does not need to do any prep work to configure primary keys.
If you would like to sync the MongoDB ObjectId to a field in the opposing data sources, just add the
_id field to the field mapping. The _id field will be read-only in the opposing source.