module Orchestrate::Rails::Tutorial::GetGraph

Getting an Orchestrate.io graph¶ ↑

The films example application includes a feature to define a sequel relationship between films. This feature is implemented using graphs. Since orchestrate.io relations don't have a depth limit, we'll even be adding a method to get the sequel's sequel!

Updating the Film model for orchestrate.io graphs.¶ ↑

Update <rails-root>/app/models/film.rb to add the methods that get the film collection's sequel graph relations.

class Film < Orchestrate::Rails::Model

  def comments
    self.events('comments')
  end

  def sequels
    self.graph('sequel')
  end

  def spawn_of_sequels
    self.graph('sequel/sequel')
  end
end

Updating the films controller.¶ ↑

Update <rails-root>/app/controllers/films_controller.rb to call the sequel instance methods from the show action:

class FilmsController < ApplicationController

  def index
    @films = Film.all
  end

  def show
    @film = Film.find params[:id]
    @comments = @film.comments
    @sequels = @film.sequels
    @spawn_of_sequels = @film.spawn_of_sequels
  end
end

Updating the view to display sequel relations.¶ ↑

Update <rails-root>/app/views/films/show.html.haml as shown:

%ul.films.list-group
 %li.list-group-item
  %h3.list-group-item-heading= @film.title
  %ul.list-group
   %li.list-group-item
    = render partial: 'films/film_info'
   - if @sequels and @sequels.length > 0
    %li.list-group-item
     = render partial: 'films/film_list', locals: { title: "Sequels", films: @sequels }
   - if @spawn_of_sequels and @spawn_of_sequels.length > 0
    %li.list-group-item
     = render partial: 'films/film_list', locals: { title: "Sequel Spawn", films: @spawn_of_sequels }
   - if @comments and @comments.length > 0
    %li.list-group-item
     = render partial: 'films/comments', locals: { comments: @comments }

Let's check it out¶ ↑

Navigate to “The Godfather” to see its sequels.

If you ran the demo app to populate the collection, you can also check out “Star Wars”.

Next¶ ↑

Adding the create action