module Arel::Predications

def not_in(other) 

def not_in(other)
  case other
  when Arel::SelectManager
    Arel::Nodes::NotIn.new(self, other.ast)
  when Enumerable
    Nodes::NotIn.new self, quoted_array(other)
  else
    Nodes::NotIn.new self, quoted_node(other)
  end
end