app/models/pdfresource.rb


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class Pdfresource < ApplicationRecord
  has_many_attached :pdfs
  has_many_attached :thumbnails
  validates :feature_slot,
            numericality: { only_integer: true, greater_than_or_equal_to: 1, less_than_or_equal_to: 3, allow_nil: true },
            allow_nil: true
end