Catching errors with bluebird promises

bluebird_promises.js

    addPreference: function(preference){
      var that = this;
      return Question.findOne(preference.questionId)
	.populate('configurator')
	.then(function(question){
	  return Preference.create({
	    configurator: question.configurator.id,
	    question: question.id,
	    selectedAnswer: preference.selectedAnswer,
	    household: that.id
	  }).then(function(p){
	    console.log(p);
	    that.preferences.add(p);
	    that.save().then(function(household){
	    return Promise.resolve(household); 
	    });
	  });
	});
    }


describe("Household model", function(){
  describe("#addPreference()", function(){
    it("Should add a Preference object", function(done){
      Household.findOne(1).exec(function(err, household){
	household.addPreference({
	  questionId: 4,
	  selectedAnswer: 3
	}).then(function (household){
	  done();
	}).catch(function(err){
	  console.log(err);
	  done(err);
	});
      });
    });
  });
});