lib/active_relation/relations/selection.rb


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module ActiveRelation
  module Relations
    class Selection < Compound
      attr_reader :relation, :predicate
  
      def initialize(relation, *predicates)
        @predicate = predicates.shift
        @relation = predicates.empty?? relation : Selection.new(relation, *predicates)
      end
  
      def ==(other)
        relation == other.relation and predicate == other.predicate
      end
  
      def qualify
        Selection.new(relation.qualify, predicate.qualify)
      end
  
      protected
      def selects
        relation.send(:selects) + [predicate]
      end
    end
  end
end