I have a scope that is supposed to conditionally return the none criteria. I noticed that when the none criteria is returned by a lambda (or regular proc via Proc.new), everything in the colllection is returned instead. The scope seems to be completely ignoring the none criteria. I tested this behavior further by making simple named scopes that simply return none and those are also ignored.

An example:

class Simple
  include Mongoid::Document

  field :name, type: String

  scope :nothing, -> { none }
end

This simple model's nothing scope would return everything in the collection, rather than not hitting the database at all. Outside of scopes, none seems to work as intended. I have also noted that this behavior transfers to {{default_scope}}s as well.