How can I index a collection of records by one of their field?
By : Michael Baker
Date : October 16 2020, 08:10 AM
hope this fix your issue If you want a container where the key itself is part of the value, you can use HashSet with a newtype to reimplement the required traits: Hash, Borrow, PartialEq and Eq. For example (link to playground):
How to add a field in all records of mongo db collection?
By : Huajun Bai
Date : March 29 2020, 07:55 AM
seems to work fine Use the $concat operator in the $project step of an aggregation framework pipeline. Running the following aggregation will give you the desired output without need to update your collection: