How to add Dropletkit in Rails

First Install the gem

gem 'droplet_kit'

then create initializer config/initializers/digitalocean.rb

then call the constant into your controller or model

  def create
    @hosting = Hosting.new(hosting_params)
    client =  DropletKit::Client.new(access_token: ENV['digitalocean_token'])
    droplet = DropletKit::Droplet.new(
      name: 'mysite.com', 
      region: 'nyc3', 
      image: 'ubuntu-14-04-x64', 
      size: 's-1vcpu-1gb'
      )
    created = client.droplets.create(droplet)

    respond_to do |format|
      if @hosting.save
        format.html { redirect_to @hosting, notice: 'Hosting was successfully created.' }
        format.json { render :show, status: :created, location: @hosting }
      else
        format.html { render :new }
        format.json { render json: @hosting.errors, status: :unprocessable_entity }
      end
    end
  end

or if you want use after_create call inside your model.