Validation

list_of_valid_states = ["Alava", "Albacete"....]

class OptionsValidator < ActiveModel::Validator
  def validate(record)
    unless list_of_valid_states.include?(record.state)
      record.errors[:state] << 'This is not a valid state!'
    end
  end
end
 
class MiModelo
  include ActiveModel::Validations
  validates_with OptionsValidator
end