process.rb

class Image < AR::Base
  validates :src, presence: true
  validate :set_status_to_missing_url, :if => lambda { src.blank? }
  
  def process
    @logo_image = RmagickHelper.new self.src
  rescue Magick::ImageMagickError => ex
    logger.error "ImageMagick can not process the image: #{ex.message}"
    ex.backtrace.each { |line| logger.debug line }
    @logo_status = 'cant_process'
  end
  
  private
  def set_status_to_missing_url
    self.status = 'missing_url'
  end
end