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Ember and Rails
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Steve Kinney
December 17, 2014
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Ember and Rails
Steve Kinney
December 17, 2014
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Transcript
Ember ♥ Rails DeRailed, December 2014
Hi. I'm Steve. @stevekinney
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Hire our students, please: http://people.turing.io/
Ember Basics
Ember draws influence from Cocoa and Rails. It began it's
life as SproutCore 2.0.
Notable Features Two-way data binding Computed properties An emphasis on
URLs Convention over configuration
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Let's look at some code.
Public Service Announcement: TurboLinks Considered Harmful
A Tale of Two MVCs
Ember and Rails both take MVC pretty seriously. (That said,
they both have a very different take on it.)
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The route fetches the model and sets up the controller.
Controllers decorate the model and handle actions.
Controllers are singletons.
Let's say you visit /notes/1 and then you visit /notes/2.
It's the same controller, but the route has switched out the model.
Controllers maintain state.
Controllers can talk to each other.
What is Ember Data?
It's kind of like ActiveRecord, but for Ember—and different.
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// models/post.js export default DS.Model.extend({ title: DS.attr('string'), body: DS.attr('text'), comments:
DS.hasMany('comments') }); // models/comment.js export default DS.Model.extend({ comment: DS.attr('string'), post: DS.belongsTo('post') });
And Now: An Example of the AJAX Requests Generated By
Ember Data
post.find('12').get('comments');
post.get('comments'); GET /posts { "posts": [ { "id": "12", "content":
"Super!", "comments": ["56", "58"] } ] }
GET /comments?ids[]=56&ids[]=58 { "comments": [ { "id": "56", "message": "Whatever",
"post": "12" }, { "id": "58", "message": "Something", "post": "12" } ] }
What just happened? Ember Data sent off two AJAX requests
to Rails in order to build the relation in the browser.
And then it cached the result in the Store.
Let's look at some code together.
Ember Tooling
The Ember Inspector
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It's like the Rails command line tools, but for Ember—
and not that different.
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Ember CLI allows you to proxy to a Rails server.
Request If Ember can't respond to a URL, it proxies
it on to Rails.
Thank you. Questions?