Document with token validator

document.rb

class Document < ActiveRecord::Base
  include UniqueTokenValidator

  UNIQUE_FIELDS = {
    key: :name,
    scope: [:description, :date],
    condition: proc { |obj| some_method(obj) }
  }
  
  validates UNIQUE_FIELDS[:key], uniqueness: {
    scope: UNIQUE_FIELDS[:scope]
  }, if: UNIQUE_FIELDS[:condition]

end