module Arel
  class Having < Compound
    attr_reader :predicates

    def initialize(relation, *predicates)
      super(relation)
      @predicates = predicates.map { |p| p.bind(relation) }
    end

    def havings
      @havings ||= relation.havings + predicates
    end

    def == other
      super || Having === other &&
               relation == other.relation &&
               predicates == other.predicates
    end
  end
end