This release in the 7.x series is primarily intended to assist with migration to Mongoid 8. To this end, Mongoid 7.5 adds deprecation warnings for functionality removed in Mongoid 8. Some of the new functionality in Mongoid 8 is also available in 7.5, as follows:

• MONGOID-4547 Implement #take / #take! for AR feature parity
• MONGOID-4998 limit arguments to #first and #last methods
• MONGOID-5402 In-memory pluck, distinct support dot notation for field path traversal

The following deprecations have been added:

• MONGOID-5431 Deprecate criteria/contextual caching
• MONGOID-5318 Deprecate "background" index option as per MongoDB 4.2+
• MONGOID-5430 Deprecate pluck behavior in map

The following issues were fixed:

• MONGOID-5330 Operator methods overwrite previous conditions

Mongoid 7.5 adds support for JRuby 9.3 and deprecates support for JRuby 9.2. Mongoid 8 will require JRuby 9.3 or newer.