What's Changed

• Fix collection.find_one(...) sorting using dicts by @santiagopardal in https://github.com/mongomock/mongomock/pull/897
• Remove usage of legacy syntax constructs by @mdomke in https://github.com/mongomock/mongomock/pull/899
• Adapt code to refactored Mongo driver GridFS implementation by @mdomke in https://github.com/mongomock/mongomock/pull/905
• Adding support for agg...

What's Changed

• Added support for $ifNull multi field support, $isNumber, $isArray by @David-Taub in https://github.com/mongomock/mongomock/pull/749
• Add read_concern kwarg to get_database. by @pcorpet in https://github.com/mongomock/mongomock/pull/790
• Add support for $isNumber and $isArray (added on v4.4). by @pcorpet in https://github.com/mongomock/mongomock/pull/789
• S...

Full support (CI) of Python 3.10 and MongoDB v5.

• Add support for partialFilterExpression to create_index (#784)
• Handle $ in update operations when it is the last field. (#787)
• Drop system collections on drop_database calls. (#788)
• Add support for "number" alias in $type (#757)
• Allow system vars expressions to generate arrays (#619)
• Handle $arrayElementAt applied to $filter *...

This release mainly brings support for pymongo v4. It is still compatible with pymongo v3 and despite the major version, in most cases it should be an easy upgrade.

Breaking Changes

• Drop support for Python 2
• If no pymongo is installed at runtime, uses pymongo v4 interface

• Add default and options to get_default_database() (#693)
• Bump the version of hacking, setting our flake8 config
• Support read_concern in database.get_collection() (#708)
• Support $toLong operator (#705)
• Fix for {$size: 1} queries on non-existent fields (#711)
• Parse `index` of $arrayElemAt. Fix #607 (#701)
• Implement the $let operator. (#698)
• Implement the $expr operator. (#...