Converting PDF to multiple PNG files, and creating a model for each PNG.

image_uploader.rb

class ImageUploader < CarrierWave::Uploader::Base

  include CarrierWave::RMagick
  include Magick

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  process :pdf? => (self)

  version :thumb do
    process :resize_to_fill => [400,500]
  end

  version :profile do
    # process :convert => 'png'
    process :resize_to_fit => [200,300]
  end

  protected

  def pdf?(new_file)
    if self.current_path.include? 'pdf'
      puts "it is pdf"
      converting(new_file)
    else
      puts "it is not pdf"
    end
  end

  def converting(new_file)   
    i = 0
    manipulate! :if => :pdf? do |image|
      pdf = ImageList.new image.filename
      jpg = pdf[i]

      @page = Page.new
      jpg.write("#{Rails.root}/public/uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}/p#{i+1}.png")
      # @page.presentation_id = ""
      @page.image = "p#{i+1}.png"
      @page.save
      i = i + 1
      puts "page #{i}"
      jpg
    end
  end
end

Do you know why it is that you have to call converting inside the conditional of a version block for it to work properly? Otherwise it seems to save the images in the wrong directory.

@ibrahima, Process :converting runs before everything, and performs different procedures on the file uploaded, this occurs even before the model is created. So because the model is not created yet, there is no model.id therefore the location it is saved in is not correct. But I think version occurs after the model is created, therefore it should have all the correct attributes of the model, such as the id. This code was not fulfilling my requirements so I had to create another uploader. will post a link for it soon.