carrierwave-blob.gemspec

# -*- encoding: utf-8 -*-

Gem::Specification.new do |s|
  s.name        = "carrierwave-blob"
  s.version     = "0.0.1"
  s.platform    = Gem::Platform::RUBY
  s.summary       = "BLOB support for Carrierwave"
  s.authors       = [ 'Karel Minarik', 'Vojtech Hyza' ]
  s.email         = [ 'karmi@karmi.cz', 'vhyza@vhyza.eu' ]

  s.files         = `git ls-files`.split("\n")
  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }

  s.require_paths = ["."]

  s.add_development_dependency "rails"
  s.add_dependency "carrierwave"
end

carrierwave-blob.rb

# encoding: utf-8

require 'railtie' if defined?(Rails)

module CarrierWave
  module Storage

    class Blob < Abstract
      class Content
        def initialize(content)
          @content = content
        end

        def url(options={})
          @content    
        end

        def to_s
          @content
        end
      end

      def store!(file)
        # require "pry"; binding.pry
        type = uploader.file.content_type
        blob = Base64.encode64(self.uploader.file.read)
        uploader.model.update_columns self.uploader.mounted_as => "data:#{type};base64,#{blob}"
      end

      def retrieve!(identifier=nil)
        Content.new uploader.model.read_attribute(self.uploader.mounted_as)
      end
    end

  end
end

carrierwave_blob_generator.rb

require 'rails/generators/base'

class CarrierwaveBlobGenerator < Rails::Generators::NamedBase
  desc "Create migration changing carrierwave column to text."
  argument :column, default: 'picture'

  def create_migration_file
    create_file "db/migrate/#{ActiveRecord::Migration.next_migration_number(1)}_update_carrierwave_column.rb", <<-CONTENT
class UpdateCarrierwaveColumn < ActiveRecord::Migration
  def change
    change_column(:#{name.tableize}, :#{column}, :text, limit: nil)
  end
end
CONTENT
  say "Run `bundle exec rake db:migrate` to apply generated migration."
  end

end

railtie.rb

require 'rails'

module CarrierWave
  class Railtie < ::Rails::Railtie
    generators do
      require "carrierwave_blob_generator"
    end
  end
end