A quick cheat sheet for Ember communication between layers

1. How to Call A From B in Ember
Some ideas to try before you go crazy
Ben Donaldson, Crowdly

2. Ember has many layers
Like an onion
Or a sandwich
Or a skyscraper
Or your LiveJournal

3. Ember has many changes

4. How do I talk between layers?
Do those ways still work?
Is it the “Ember Way”?

5. How do I talk between layers?
I’ll list a bunch of ways that I found
Do those ways still work?
Yes, at least for the last few weeks
Is it the “Ember Way”?
Until it stops working

6. The List

7. The List
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Unlike kangaroos and eucalyptus-eating possums, koalas are hindgut fermenters, and their digestive retention can last for up to 100 hours in the wild, or up to 200 hours in
captivity. This is made possible by the extraordinary length of their caecum—200 cm (80 in) long and 10 cm (4 in) in diameter—the largest proportionally of any animal. Koalas
can select which food particles to retain for longer fermentation and which to pass through. Large particles typically pass through more quickly, as they would take more time
to digest. While the hindgut is proportionally larger in the koala than in other herbivores, only 10% of the animal's energy is obtained from fermentation. Since the koala gains
a low amount of energy from its diet, its metabolic rate is half that of a typical mammal, although this can vary between seasons and sexes. The koala conserves water by
passing relatively dry faecal pellets high in undigested fibre, and by storing water in the caecum.

8. The List
We’ll have two models, called Apple and Orange
Each has their own route, controller, view, and template
This is just for the simplest case

9. When I’m AppleRoute…
Apple (the model)
this.modelFor(‘apple’)
OrangeRoute
this.get(‘router’).getHandler(‘orange’)
AppleController
this.controllerFor(‘apple’)
AppleView - no idea
Apple Template - no idea

10. When I’m AppleController…
Apple (the model)
this.get(‘content’) (if it’s an Ember.ObjectController)
AppleRoute
this.get(‘target’) (if you’re currently on that route)
OrangeController
needs: [‘orange’] (in the root of AppleController)
this.get(‘controllers.orange’)
AppleView - no idea
Apple Template - no idea

11. When I’m AppleView…
Apple (the model)
this.get(‘context’) (if AppleController is an Ember.ObjectController)
this.get(‘controller.content’) (if AppleController is an Ember.ObjectController)
AppleRoute
this.get(‘controller.target’) (if you’re currently on that route)
AppleController
this.get(‘controller’)
OrangeView - no idea
Apple Template
this.get(‘template’) (for the handlebars function, but you wouldn’t touch that much)
this.get(‘element’) (for the DOM element)

12. When I’m the Apple Template…
Apple (the model)
this.get(‘view.context’) (if AppleController is an Ember.ObjectController)
this.get(‘controller.content’) (if AppleController is an Ember.ObjectController)
AppleRoute
this.get(‘controller.target’) (if you’re currently on that route)
AppleController
this.get(‘controller’)
AppleView
this.get(‘view’)
Orange Template - no idea

13. In case of emergency...
Warning: these are not “elegant” or “the Ember Way” but could “let you meet a deadline”
Make an init function and make manual connections
AppleView = Em.View.extend({
init: function() {
this.get(‘controller’).set(‘yourAppleView’, this);
}
}
Ask the almighty ‘container’, available pretty much everywhere in your app.
this.get(‘container’).lookup(‘view:apple’)

14. THANK YOU
THESE SLIDES WILL BE ONLINE SOMEWHERE

15. THANK YOU
THESE SLIDES WILL BE ONLINE SOMEWHERE
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