merb_paperclip.rb

# Monkeypatch paperclip 2.1.2 to work with merb

module Paperclip
  class Attachment
    def assign uploaded_file
      %w(file_name).each do |field|
        unless @instance.class.column_names.include?("#{name}_#{field}")
          raise PaperclipError.new("#{self} model does not have required column '#{name}_#{field}'")
        end
      end

      if uploaded_file.is_a?(Paperclip::Attachment)
        uploaded_file = uploaded_file.to_file(:original)
      end

      return nil unless valid_assignment?(uploaded_file)
      logger.info("[paperclip] Assigning #{uploaded_file.inspect} to #{name}")

      queue_existing_for_delete
      @errors = []
      @validation_errors = nil

      return nil if uploaded_file.nil?

      logger.info("[paperclip] Writing attributes for #{name}")
      if (uploaded_file.respond_to?(:original_filename) && uploaded_file.respond_to?(:content_type))
        @queued_for_write[:original] = uploaded_file.to_tempfile
        @instance[:"#{@name}_file_name"] = uploaded_file.original_filename.strip.gsub /[^\w\d\.\-]+/, '_'
        @instance[:"#{@name}_content_type"] = uploaded_file.content_type.strip
        @instance[:"#{@name}_file_size"] = uploaded_file.size.to_i
      else
        @queued_for_write[:original] = uploaded_file[:tempfile]
        @instance[:"#{@name}_file_name"] = uploaded_file[:filename].strip.gsub /[^\w\d\.\-]+/, '_'
        @instance[:"#{@name}_content_type"] = uploaded_file[:content_type].strip
        @instance[:"#{@name}_file_size"] = uploaded_file[:size].to_i
      end
      @instance[:"#{@name}_updated_at"] = Time.now

      @dirty = true

      post_process
    ensure
      validate
    end

    def geometry style = default_style
      @geometries ||= {}
      @geometries[style] ||= Geometry.from_file path(style)
    end

    private
    def valid_assignment? file #:nodoc:
      file.nil? || (file.respond_to?(:original_filename) && file.respond_to?(:content_type)) || (file.key?(:filename) && file.key?(:content_type))
    end

    def logger
      instance.logger
    end
  end
end

Paperclip::Attachment.interpolations[:rails_root] = lambda{|attachment,style| Merb.root } if defined? Paperclip::Attachment.interpolations