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module Cards
  class BlackListedQuery
    class << self
      delegate :call, to: :new
    end

    def initialize(relation = Card.unscoped)
      @relation = relation
    end

    def call
      @relation.where "cards.black_listed_at IS NOT NULL"
    end
  end
end

class Card
  scope :black_listed, Cards::BlackListedQuery
end