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

Add the convert_options into the styles themselves. Here is an example for a generic rails Image model which contains two styles and corresponding booleans to enable these styles.

# == Schema Information
#
# Table name: images
#
#  id                 :integer          not null, primary key
#  image_file_name    :string(255)
#  image_content_type :string(255)
#  image_file_size    :integer
#  hero_style         :boolean 
#  thumb_style        :boolean 
#  image_updated_at   :datetime
#  created_at         :datetime         not null
#  updated_at         :datetime         not null
#

class Image < ActiveRecord::Base

  # These are the postprocessing options. 
  # The boolean _style? attributes controls which styles are created. 

  STYLES = {
    hero: {geometry: "2500x800#", convert_options: "-quality 75 -strip", source_file_options: ""},
    thumb: {geometry: "312x100#", convert_options: "-quality 75 -strip", source_file_options: ""}  
  }

  has_attached_file :image,
    styles: 
      lambda { |file|
        r = {}
        STYLES.keys.each do |stylename|
          r[stylename] = STYLES[stylename] if file.instance.method("%s_style?" % stylename).call
        end
        return r
      }

  validates_attachment :image, :presence => true,
  content_type: { content_type: ["image/jpeg", "image/png"] },
  file_name: {matches: [/png\Z/, /jpe?g\Z/]}



end