Observe change on any attribute of an Ember Data

问题

Is this possible? Something like .observes('_data'), but not.

The use case is, I have a Decays mixin that has some CPs that say how long its been since a model has been updated. I'd like these CPs to be able to update if any of the model's attrs have changed. isDirty also won't work, since my use case uses store.push to update the model.

回答1:

I don't think there's a built-in way to do it, but it wouldn't be very difficult to make one. Just create a base class for all of your models and override the set function. Something like this:

var BaseModel = DS.Model.extend({
    set: function(keyName, value) {
        var ret = this._super.apply(this, arguments);
        var attributes = Ember.get(this.constructor, 'attributes');

        if (attributes[keyName]) {
            this.trigger('attributeChanged');
        }

        return ret;
    }
});

Then, you can listen for changes to any attribute like this:

model.on('attributeChanged', function() {});

I think you can even do something like this in the case of a controller or similar object (although I haven't tested it):

Controller.extend(Ember.Evented, {
    modelPropertyChanged: function() {

    }.on('model.attributeChanged')
});

来源：https://stackoverflow.com/questions/29110623/observe-change-on-any-attribute-of-an-ember-data