gistfile1.txt

class User
  has_one :plan
  
  def has_feature?(name)
    plan.has_feature? name
  end
end

class Plan
  has_many :line_items
  
  def has_feature?(name)
    line_items.find { |l| l.name.to_sym == name.to_sym }
  end
end

class LineItem
  # name:symbol
  # cost_cents:integer
  # whatever else
end