How to create thumbnail for first pdf page with carrierwave

Question

I'm processing thumbnail for PDF file in this way:

  version :thumb do
    process :resize_to_limit => [260, 192]
    process :convert => :jpg
    process :set_content_type
  end

  def set_content_type(*args)
    self.file.instance_variable_set(:@content_type, "image/jpeg")
  end

But when PDF file is multipage it produces thumbnail for all pages in one jpg file. Is there any way to produce thumbnail only for first page?

Answer 1

I submitted a patch earlier this year to do just this. Use a custom processor:

def cover 
  manipulate! do |frame, index|
    frame if index.zero?
  end
end

process :cover

Answer 2

Great solution by Tanzeeb! Thank you.

So i could do something like this:

 def cover 
    manipulate! do |frame, index|
      frame if index.zero?
    end
  end   

and used this for the thumb generation

  version :thumb do
    process :cover    
    process :resize_to_fill => [50, 50, Magick::NorthGravity]
    process :convert => 'png'
  end

great!