conditional_carrierwave

document_uploader.rb

# encoding: utf-8

class DocumentUploader < CarrierWave::Uploader::Base

  # http://stackoverflow.com/questions/29624223/papertrail-doesnt-play-nice-with-carrierwave-and-remove-previously-stored-file

  #configure do |config|
  #  config.remove_previously_stored_files_after_update = false
  #end

  include CarrierWave::MiniMagick
  include CarrierWave::MimeTypes

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    #"#{model.class.to_s.underscore}/#{model.id}/"
    "#{model.uploadable_type.downcase.pluralize.underscore}/#{model.parent_asset.id}/uploads/#{model.id}/"
  end
  
  def filename
    "#{original_filename}" if original_filename.present?
  end
  
  # Create different versions of your uploaded files:
  version :version do
    def store_dir 
      "#{model.uploadable_type.downcase.pluralize.underscore}/#{model.parent_asset.id}/uploads/#{model.id}/versions/#{model.versions.last.id}/"
    end
    def full_filename (for_file = model.file.file)
      "#{original_filename}" if original_filename.present? 
    end 
  end

    version :thumb, :if => :image? do
      process :resize_to_limit => [20, 20]
      process :convert => 'jpg'
      def full_filename (for_file = model.file.file) 
        "preview_thumb.jpg" 
      end 
    end

    version :small, :if => :image? do
      process :resize_to_limit => [200, 100]
      process :convert => 'jpg'
      def full_filename (for_file = model.file.file) 
        "preview_small.jpg" 
      end 
    end

    version :large, :if => :image? do
      process :resize_to_limit => [500, 700]
      process :convert => 'jpg'
      def full_filename (for_file = model.file.file) 
        "preview_large.jpg" 
      end 
    end
    
  
  protected

    def image?(new_file)
      new_file.content_type.start_with? 'image'
    end

end