gistfile1.js

// Ideally you would set up a flash message service as a dependency injection 
// (which can be a little involved), but here's a quick hack
// P.S. this was transpiled down from CoffeeScript, so it might look a bit funky

App.Post = DS.Model.extend({
  errorMessages: Em.A([]),
  didBecomeDirty: Em.observer('isDirty', function() {
    return Em.run.debounce(this, '_handleSave', 500, true);
  }),
  _handleSave: function() {
    var flashes;
    flashes = this.get('errorMessages');
    return this.save().then(function() {
      return flashes.pushObject({
        message: 'Your post was auto saved'
      });
    }).catch(function(error) {
      if (error.status === 500) {
        return flashes.pushObject({
          message: "Server error. Couldn't auto save."
        });
      }
    }).finally((function(_this) {
      return function() {
        return _this._clearErrorMessages(6000);
      };
    })(this));
  },
  _clearErrorMessages: function(timeout) {
    return Em.run.later(this, function() {
      return this.get('errorMessages').clear();
    }, timeout);
  }
});