conditional convert options paperclip

Question

After some research I was able to add styles based on my image_class column.

Model.rb

has_attached_file :image,
                    


        

Answer 1

The approved answer doesn't work. It can be read in the comments and the author acknowledges that it hasn't been tested in code.

This code does work:

has_attached_file :image,
                  :styles => lambda { |attachment|

                    thumb_convert_options = case attachment.instance.image_class
                      when "poster"
                        "-flop"
                      when "cover"
                        "-enhance"
                    end

                    {
                      thumb: {
                        convert_options: thumb_convert_options
                      }
                    }
                  }

The correct approach is to have convert_options inside the styles lambda; having it as a separate lambda does not work, at least for Paperclip version 4.1 and higher.

To keep my answer in one place, I've put all the code inline and omitted all styles beside thumb. Obviously to implement this you should keep the method decide_convert_options.