I like CarrierWave. That being said, I don't like tying up app instances waiting for images to process and upload to S3. Depending on the size of the file, this could take a while sometimes timing out Heroku. This gem addresses that. After the file has been uploaded and CarrierWave caches the base file, it halts the process and queues a job.
In Rails, add the following your Gemfile:
Add a column to the model you wan to background which will store the temp file location:
add_column :users, :avatar_tmp, :string
In your CarrierWave uploader file:
class AvatarUploader < CarrierWave::Uploader::Base include ::CarrierWave::Backgrounder::DelayStorage #ect... end
In your model:
mount_uploader :avatar, AvatarUploader store_in_background :avatar
Currently ActiveRecord is the default orm and I have not tested this with others but it should work by adding the following to your carrierwave initializer:
DataMapper::Model.send(:include, ::CarrierWave::Backgrounder::ORM) # or Mongoid::Document::ClassMethods.send(:include, ::CarrierWave::Backgrounder::ORM) # or Sequel::Model.send(:extend, ::CarrierWave::Backgrounder::ORM)
Word Of Caution
Temp files are stored by default in the tmp directory. They are not guaranteed to be available when your workers process them! For instance, on Heroku, they get blown away on every deploy. If image upload is the main function of your app, I would store the tmp files in a non-volatile directory if you have the option.
Transfer tests from rails app.
Copyright © 2011 Larry Sprock
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