The following code raises NotImplementedError:

Band.any_of(
  { a: 1 }, { :created_at.gte => Date.today}
)

The error is produced when:

• Multiple conditions are given in the same invocation
• Symbol operators are used (which are implemented using Key instances)
• The value being given is evolved to a different value (e.g. the field being queried is a Time field and the value given is a Date instance)

Operators other than any_of may be affected also, I didn't check. Whichever operators are affected should be fixed by the fix here.

SO report: https://stackoverflow.com/questions/65324196/error-on-mongoid-query-with-any-of-and-conditions-on-a-same-attribute#comment115518196_65324196