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Paperclip launches processors in selected style

I have an xxx image handler, and I have two styles in the model: large and large.

How can I process with: xxx only the image: thumb, leaving: the large image intact?

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4 answers

By default, the Rake task updates all thumbnails. Keep in mind that it will not touch / process the original image.

You may have a look at the Rakefile and Attachment and change it to indicate the specific size of the sketch, but the current design assumes that you want to take the original and redo all the thumbnails from the original.

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, . , !

has_attached_file :screenshot,
 :default_style => :full,
 :styles => {
   :full => "280x210",
   :cropped => { :processors => [:screenshot_crop] }
 }
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paperclip.rake:

   desc "Reprocesses your attachments style (set CLASS, ATTACHMENT and STYLE)"
    task :style => :environment do
      module JustForOneDay
        NAME = ENV['STYLE']
      end

      module ::Paperclip
        class Attachment
          def post_process_styles #:nodoc:
            @styles.each do |name, args|
              if JustForOneDay::NAME == name
                begin
                  raise RuntimeError.new("Style #{name} has no processors defined.") if args[:processors].blank?
                  @queued_for_write[name] = args[:processors].inject(@queued_for_write[:original]) do |file, processor|
                    Paperclip.processor(processor).make(file, args, self)
                  end
                rescue PaperclipError => e
                  log("An error was received while processing: #{e.inspect}")
                  (@errors[:processing] ||= []) << e.message if @whiny
                end
              end
            end
          end
        end
      end

      for_all_attachments do |instance, name|
        result = instance.send(name).reprocess!
      end
    end
  end

2.3.1.1

Paperclip 2.3.3 :

def post_process_styles #:nodoc:
  styles.each do |name, style|
    if JustForOneDay::NAME == name
    begin
      raise RuntimeError.new("Style #{name} has no processors defined.") if style.processors.blank?
      @queued_for_write[name] = style.processors.inject(@queued_for_write[:original]) do |file, processor|
        Paperclip.processor(processor).make(file, style.processor_options, self)
      end
    rescue PaperclipError => e
      log("An error was received while processing: #{e.inspect}")
      (@errors[:processing] ||= []) << e.message if @whiny
    end
    end
  end
end

, attachment.rb .

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- , .

, . , Paperclip , . , , , .

( - Ryan Bate Railscast Episode 182.)

module Paperclip
  class Cropper < Thumbnail
    def transformation_command
      SPECIAL_PROCESSING_FLAG = "150x150"
      if crop_command && super.include?(SPECIAL_PROCESSING_FLAG)
        crop_command + super.sub(/ -crop \S+/, '')
      else
        super 'do nothing fancy
      end
    end

    def crop_command
      target = @attachment.instance
      if target.cropping?
        " -crop '#{target.crop_w.to_i}x#{target.crop_h.to_i}+#{target.crop_x.to_i}+#{target.crop_y.to_i}'"
      end
    end
  end
end

, , .

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