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base.rb
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base.rb
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# encoding: utf-8
require 'backgrounder/workers'
module CarrierWave
module Backgrounder
module ORM
##
# Base class for all things orm
module Base
##
# User#process_in_background will process and create versions in a background process.
#
# class User < ActiveRecord::Base
# mount_uploader :avatar, AvatarUploader
# process_in_background :avatar
# end
#
# The above adds a User#process_upload method which can be used at times when you want to bypass
# background storage and processing.
#
# @user.process_avatar = true
# @user.save
#
# You can also pass in your own workers using the second argument in case you need other things done
# during processing.
#
# class User < ActiveRecord::Base
# mount_uploader :avatar, AvatarUploader
# process_in_background :avatar, CustomWorker
# end
#
# In addition you can also add a column to the database appended by _processing with a type of boolean
# which can be used to check if processing is complete.
#
# def self.up
# add_column :users, :avatar_processing, :boolean
# end
#
def process_in_background(column, worker=::CarrierWave::Workers::ProcessAsset)
attr_accessor :"process_#{column}_upload"
mod = Module.new
include mod
_define_shared_backgrounder_methods(mod, column, worker)
end
##
# #store_in_background will process, version and store uploads in a background process.
#
# class User < ActiveRecord::Base
# mount_uploader :avatar, AvatarUploader
# store_in_background :avatar
# end
#
# The above adds a User#process_<column>_upload method which can be used at times when you want to bypass
# background storage and processing.
#
# @user.process_avatar_upload = true
# @user.save
#
# You can also pass in your own workers using the second argument in case you need other things done
# during processing.
#
# class User < ActiveRecord::Base
# mount_uploader :avatar, AvatarUploader
# store_in_background :avatar, CustomWorker
# end
#
def store_in_background(column, worker=::CarrierWave::Workers::StoreAsset)
attr_accessor :"process_#{column}_upload"
mod = Module.new
include mod
mod.class_eval <<-RUBY, __FILE__, __LINE__ + 1
def remove_#{column}=(value)
super
self.process_#{column}_upload = true
end
def write_#{column}_identifier
super and return if process_#{column}_upload
self.#{column}_tmp = _mounter(:#{column}).cache_name if _mounter(:#{column}).cache_name
end
def store_#{column}!
super if process_#{column}_upload
end
RUBY
_define_shared_backgrounder_methods(mod, column, worker)
end
private
def _define_shared_backgrounder_methods(mod, column, worker)
mod.class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{column}_updated?; true; end
def set_#{column}_processing
self.#{column}_processing = true if respond_to?(:#{column}_processing)
end
def enqueue_#{column}_background_job?
!remove_#{column}? && !process_#{column}_upload && #{column}_updated?
end
def enqueue_#{column}_background_job
CarrierWave::Backgrounder.enqueue_for_backend(#{worker}, self.class.name, id.to_s, #{column}.mounted_as)
end
RUBY
end
end # Base
end #ORM
end #Backgrounder
end #CarrierWave