check_comment_size.rb

before_save :check_comment_size, if: :max_comment_size

class << self
  def max_comment_size
    return @max_comment_size if defined? @max_comment_size
    @max_comment_size = comment_field.try(:[], :data_length)
  end

  def comment_field
    put_procedure = procedure_methods[:put][:procedure]
    return nil unless put_procedure
    put_procedure.arguments[0][:vch_vc_rem]
  end
end # class << self

delegate :max_comment_size, to: :'self.class'

private
  def check_comment_size
    size = vc_rem.try(:bytesize) || 0
    if size > max_comment_size
      raise ArgumentError, I18n.t(:'api.common.errors.long_comment', :size => size, :max_size => max_comment_size)
    end
    true
  end