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Pseudo Setup:

def AModel
 has_many :test_models
end

def TestModel
 belongs_to a_model
  scope :test_scope, where(:test_field.exists => false)
end

Then when I call:

AModel.first.test_models.test_scope

I get:

#<Mongoid::Criteria
  selector: {"a_model_id"=>"1", "test_field"=>nil}
  options:  {}
  class:    TestModel
  embedded: false>

but the written out query is different (and correct)

AModel.first.test_models.where(:test_field.exists => false)

returns

#<Mongoid::Criteria
  selector: {"a_model_id"=>"1", "test_field"=>{"$exists"=>false}}
  options:  {}
  class:    TestModel
  embedded: false>

This only appears to be a problem when calling on a 'related' object.