gistfile1.coffee

`import Ember from 'ember'`

IndexController = Ember.ObjectController.extend
  needs: ['application']
  actions:
  hasProjects: (->
    @get('model.length') > 0
  ).property('model.length')
  
`export default IndexController`



# application.hbs

{{onboarding-tour projects=controllers.index.hasProjects}}

# components/onboarding-tour.coffee
`import Ember from 'ember'`

OnboardingTour = Ember.Component.extend
  projects: null
  tour: null
  didInsertElement: ->
    ....
  startTour: (->
    @get('tour').start() unless @get('projects')
  ).observes('projects')