Ruby client for Hypernova.
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hypernova-ruby Build Status

A Ruby client for the Hypernova service

Getting Started

Add this line to your application’s Gemfile:

gem 'hypernova'

And then execute:

$ bundle

Or install it yourself as:

$ gem install hypernova

In Rails, create an initializer in config/initializers/hypernova.rb.

# Really basic configuration only consists of the host and the port
Hypernova.configure do |config| = "localhost"
  config.port = 80

Add an :around_filter to your controller so you can opt into Hypernova rendering of view partials.

# In my_controller.rb
require 'hypernova'

class MyController < ApplicationController
  around_filter :hypernova_render_support

Use the following methods to render React components in your view/templates.

    :name => 'Person',
    :color => 'Blue',
    :shape => 'Triangle'


You can pass more configuration options to Hypernova.

Hypernova.configure do |config|
  config.http_adapter = :patron # Use any adapter supported by Faraday = "localhost"
  config.port = 80
  config.open_timeout = 0.1
  config.scheme = :https # Valid schemes include :http and :https
  config.timeout = 0.6

If you do not want to use Faraday, you can configure Hypernova Ruby to use an HTTP client that responds to post and accepts a hash argument.

Hypernova.configure do |config|
  # Use your own HTTP client!
  config.http_client =

You can access a lower-level interface to exactly specify the parameters that are sent to the Hypernova service.

<% things.each |thing| %>
        :name => 'your/component/thing.bundle.js',
        :data => thing
<% end %>

You can also use the batch interface if you want to create and submit batches yourself:

batch =

# each job in a hypernova render batch is identified by a token
# this allows retrieval of unordered jobs
token = batch.render(
  :name => 'some_bundle.bundle.js',
  :data => {foo: 1, bar: 2}
token2 = batch.render(
  :name => 'some_bundle.bundle.js',
  :data => {foo: 2, bar: 1}
# now we can submit the batch job and await its results
# this blocks, and takes a significant time in round trips, so try to only
# use it once per request!
result = batch.submit!

# ok now we can access our rendered strings.
foo1 = result[token].html_safe
foo2 = result[token2].html_safe


Hypernova enables you to control and alter requests at different stages of the render lifecycle via a plugin system.


All methods on a plugin are optional, and they are listed in the order that they are called.


# initializers/hypernova.rb
require 'hypernova'

class HypernovaPlugin
  # get_view_data allows you to alter the data given to any individual
  # component being rendered.
  # component is the name of the component being rendered.
  # data is the data being given to the component.
  def get_view_data(component_name, data)
    phrase_hash = data[:phrases]
    data[:phrases].keys.each do |phrase_key|
      phrase_hash[phrase_key] = "test phrase"

  # prepare_request allows you to alter the request object in any way that you
  # need.
  # Unless manipulated by another plugin, request takes the shape:
  # { 'component_name.js': { :name => 'component_name.js', :data => {} } }
  def prepare_request(current_request, original_request)
    current_request.keys.each do |key|
      phrase_hash = req[key][:data][:phrases]
      if phrase_hash.present?
        phrase_hash.keys.each do |phrase_key|
          phrase_hash[phrase_key] = phrase_hash[phrase_key].upcase

  # send_request? allows you to determine whether a request should continue
  # on to the hypernova server.  Returning false prevents the request from
  # occurring, and results in the fallback html.
  def send_request?(request)

  # after_response gives you a chance to alter the response from hypernova.
  # This will be most useful for altering the resulting html field, and special
  # handling of any potential errors.
  # res is a Hash like { 'component_name.js': { html: String, err: Error? } }
  def after_response(current_response, original_response)
    current_response.keys.each do |key|
      hash = current_response[key]
      hash['html'] = '<div>hello</div>'

  # NOTE: If an error happens in here, it won’t be caught.
  def on_error(error, jobs)
    puts "Oh no, error - #{error}, jobs - #{jobs}"



After checking out the repo, run bin/setup to install dependencies. Then, 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 to create a git tag for the version, push git commits and tags, and push the .gem file to


  1. Fork it ( )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request