application_controller.rb

class ApplicationController < ActionController::Base
  include LtiProvider::LtiApplication
  
  # ...
end

Gemfile

# ...

gem 'lti_provider_engine', :require => 'lti_provider'

# ...

lti.yml

default: &default
  key: your_key
  secret: your_secret

development:
  <<: *default

test:
  <<: *default

production:
  <<: *default

routes.rb

# ...

mount LtiProvider::Engine => "/"

# ...

run.sh

bundle install
bundle exec rake railties:install:migrations
bundle exec rake db:migrate