Getting related model in change handler for has-one relationship

[kevindente]

Maybe I'm missing something, but currently there doesn't seem to be a clean way to do the following for a has-one relationship:

1. Listen for the change of a related model
2. In the event handler for the change, access the new value.

For example, assume Foo has-one Bar. You can listen for a change in Foo's Bar property using foo.on('change:bar_id', handler). But in the handler, you can't currently use foo.bar() to access the new property. This is because in One.replace, the code is:

  model.set(this.id, other.id);
  model[this.store] = other;

So the change gets triggered before the child model gets stored back on the parent.

Is this by design? A bug? Is there another way to accomplish this?

[mponizil]

Hi @kevindente. I believe you're looking for the "associate:bar" event which gets triggered in the next line with this.associate(other, model).

[kevindente]

Correct me if I'm wrong, but by my reading that call triggers the associate event on the child model (Bar in my example), not the parent (Foo).