How to manage newly created objects without “saving” before transitioning to a new route it in emberjs?

问题

I have an issue where I have a resource with a new route. When I transition to that new route I create a new object. On the form I have button to cancel, which removes that object. However, if I click a link on my navigation, say going back to the resource index, that object is there with whatever I put in the form. What's the best way of managing creating objects then moving away from the form?

My routes:

App.Router.map(function() {
  this.resource('recipes', function() {
    this.route('new');
    this.route('show', { path: '/:recipe_id' });
  });

  this.resource('styles');
});

App.RecipesNewRoute = Ember.Route.extend({
  model: function() {
    return App.Recipe.createRecord({
      title: '',
      description: '',
      instructions: ''
    });
  },

  setupController: function(controller, model) {
    controller.set('styles', App.Style.find());
    controller.set('content', model);
  }
});

My controller for the new route:

App.RecipesNewController = Ember.ObjectController.extend({
  create: function() {
    this.content.validate()
    if(this.content.get('isValid')) {
      this.transitionToRoute('recipes.show', this.content);
    }
  },

  cancel: function() {
    this.content.deleteRecord();
    this.transitionToRoute('recipes.index');
  },

  buttonTitle: 'Add Recipe'
});

I'm using version 1.0.0.rc.1

Thanks!

回答1:

Any code that you place in the deactivate method of your route will get executed every time you leave that route. The following code will delete the new model if the user hasn't explicitly saved it.

App.RecipesNewRoute = Ember.Route.extend({
    // ...

    deactivate: function() {
        var controller = this.controllerFor('recipes.new');
        var content = controller.get('content');
        if (content && content.get('isNew') && !content.get('isSaving'))
            content.deleteRecord();
    },

    // ...
});

As an added bonus, you now don't need to explicitly delete the record when the user presses the cancel button.

来源：https://stackoverflow.com/questions/15603661/how-to-manage-newly-created-objects-without-saving-before-transitioning-to-a-n

标签

forms

ember.js

persistence