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  1. rails 3 not nil
  2. MyModel.where(:some_id => !nil)
  3.  
  4. MyModel.where("some_id is not null")
  5.  
  6. MyModel.where(MyModel.arel_table['some_id'].not_eq(nil))
  7.  
  8. MyModel.where("some_id IS NOT NULL")
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