Paperclip attachments on the backend in a delayed process.
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
$ gem install paperweight
Paperclip as you normally would, according to their docs. Then, add an additional
*_processing string field to the model for which you want to process attachments in the background, where
* is the name of the attachment that you specified in your model's call to
class AddImageProcessingToPosts < ActiveRecord::Migration[5.2] def change add_column :posts, :image_processing, :string end end
This column will be used to hold the temporary URL of the image that needs to be processed. It will override all calls to the
#url method on
Paperclip attachments until the processing is done so that there's no break in the visibility of the image.
Then, add the ability to update the
*_url attribute from the controller.
class PostsController < ApplicationController # PUT|PATCH /posts/:id def update post = Post.find(params[:id]) if post.update(post_params) render json: post else render error: post.error, status: :unprocessable_entity end end private def post_params params.permit(:image_url) end end
From now on, updating this attribute will queue a job in the background to update the image later.
You can provide additional configuration options through the
Paperweight.configure method, as in:
Paperweight.configure do |config| config.download_attempts = 10 config.max_size = 20 * 1024 * 1024 end
The current configuration options include:
download_attempts- defaults to 1
max_size- defaults to 10 MB
After checking out the repo, run
bin/setup to install dependencies. Then, run
rake test to run the tests. You can also run
bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run
bundle exec rake install. To release a new version, update the version number in
version.rb, and then run
bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the
.gem file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/CultureHQ/paperweight.
The gem is available as open source under the terms of the MIT License.