crop_and_resize.rb

SIZES_ARR = [[167, 200, 'S'], [325, 390, 'M'], [625, 750, 'L']]
SIZES = [%w[small S], %w[medium M], %w[large L], %w[extra_large EL]]

def crop_and_resize
  key = self.img.path[1..-1]
  S3.bucket('unikaihatsu-s3').object(key).get(response_target: Rails.public_path.join(self.img_file_name))
  original_file = Rails.public_path.join(self.img_file_name)
  image = Magick::Image.read(Dir.glob(original_file).first)
  cropped_img = image[0].crop(150, 0, 1500, 1800).write(Rails.public_path.join("EL_#{self.img_file_name}"))
  File.delete(original_file) if File.exist? original_file
  SIZES_ARR.each do |size_data|
    resize_image(cropped_img, size_data.first, size_data.second, size_data.last)
  end
  SIZES.each do |size|
    upload_and_delete_local_file(key, size.first, size.last)
  end
rescue => e
  logger.error(e.message)
end