The 2.0 Ruby driver implements some of the CRUD spec on Collection as expected (insert_one, insert_many, bulk_write) but put most of the other methods in a fluent API, hanging off of find(). The CRUD spec doesn't define a fluent API.

This ticket tracks implementation of the full CRUD API as defined in the spec. The fluent API can stay.

https://github.com/mongodb/specifications/blob/master/source/crud/crud.rst