module Arel module Nodes class Unary < Arel::Nodes::Node attr_accessor :expr alias :value :expr def initialize expr super() @expr = expr end def hash @expr.hash end def eql? other self.class == other.class && self.expr == other.expr end alias :== :eql? end %w{ Bin Group Having Limit Not Offset On Ordering Top Lock DistinctOn }.each do |name| const_set(name, Class.new(Unary)) end end end