Async rendering Rails page

Example:
We have movie with rating, which gets from IMDB

	# app/controllers/movies_controller.rb
	class MoviesController < ApplicationController
	def show
	@movie = Movie.find(params[:id])
	@movie_rating = IMDB.movie_rating(@movie)
	end
	end
	# app/views/movies/show.html.haml
	%h1
	Information about #{@movie.title}
	%p= @movie.description
	%p
	Movie rating on IMDB: #{@movie_rating}

view raw async-01.rb hosted with ❤ by GitHub

But page will load only after rating got from IMDB site.
To not wait for it - we use async

	# app/views/movies/show.html.erb
	%h1
	Information about #{@movie.title}
	%p= @movie.description
	= render_async movie_rating_path(@movie.id)
	# config/routes.rb
	get :movie_rating, controller: :movies
	# app/controllers/movies_controller.rb
	def movie_rating
	@movie_rating = IMDB.movie_ratings(@movie)
	render partial: 'movie_ratings'
	end
	# app/views/movies/_movie_rating.html.erb
	%p
	Movie rating on IMDB: #{@movie_rating}
	# app/views/layouts/application.html.erb
	= content_for :render_async

view raw async-02.rb hosted with ❤ by GitHub

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