Xporter

ruby gem for DSL creating streaming CSV exports.

Add this line to your application's Gemfile:

gem 'xporter'

And then execute:

$ bundle

Or install it yourself as:

$ gem install xporter

In most cases, you'll use this library in a rails app, to organize different exporters and optionally use Live Streaming from the controller to browser to begin streaming results straight from the database to the client.

To define an exporter, simply place a file in the app/exporters directory in your rails app (restarting app server if creating directory for the first time).

# app/exporters/admin_exporter.rb
class AdminExporter < Xporter::Exporter
  model User
  decorates AdminDecorator

  column(:name)
  column(:email)
  column(:dynamic) { |record| record.object_id }
end

With an exporter defined, you'll want to convert a collection of objects into a CSV string.

exporter = AdminExporter.new
exporter.generate(User.all)
# => "Name,Email,Dynamic\nJustin,justin@madebylotus.com,12345511\n"

If provided an ActiveRecord::Relation, we'll fetch records lazily in batches from ActiveRecord.

With an exporter defined, you'll want to convert a collection of objects and stream to the browser immediately.

class AdministratorsController < ApplicationController
  include Xporter::FileStreamer

  def index
    @users = User.all

    respond_to do |format|
      format.html
      format.csv do
        stream_file "administrators-export-#{ SecureRandom.uuid }".parameterize, 'csv' do |stream|
          AdminExporter.stream(@users, stream)
        end
      end
    end
  end

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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/[USERNAME]/xporter. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Xporter project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.