Changing a belongsTo property doesn't set the model's isDirty to true

[johnnyoshika]

Here's an example model:

App.Book = DS.Model.extend({
  title: DS.attr('string'),
  author: DS.belongsTo('author')
});

Changing the belongsTo property (author) should set the book's isDirty to true, but it doesn't. This also means that DS.Model.rollback() doesn't work. Here's a jsbin:

http://emberjs.jsbin.com/zifaqa/2/edit?html,js,output

[oneeman]

I'm not too familiar with the topic, but I've seen it discussed in other issues here. I believe the newest one is #2122 .
And some going further back with more information:
#1367 (with some discussion)
#1514 (with some possible solutions)

[bradleypriest]

Thanks for your comments. Basically, tracking dirtiness across relationships is a non-trivial problem with often application-specific semantics.

That said we would love insights on suggestions to help pave the cowpaths.
Please feel free to add your thoughts on the other open issues or create a new discussion at https://discuss.emberjs.com

[timrwood]

I've opened an rfc for this issue here. Please weigh in.

emberjs/rfcs#21