ember - putting save action in route but then how to set model

i have a projects resource with nested tasks. i am attempting to save a task.

i originally had the save action in my controller and worked, but i moved it to my routes/tasks/new.js

now i cannot seem to set the model properly.

this is what i have so far:

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return this.modelFor('task');
  },

  actions: {
    save: function() {
      var _this = this;
      this.get('task').save().then(function() {
        _this.set('task', _this.store.createRecord('task'));
        _this.transitionToRoute('tasks');
      }, function(){
        alert("That failed!");
      });
    },

    cancel: function() {
      this.transitionToRoute('tasks');
    }
  }
});

i have also tried using return this.store.createRecord('task') as my model. and replacing task with currentModel when i do that.

this is my Router:

Router.map(function() {
  this.resource('projects', function() {
    this.route('show', { path: ':project_id'}, function() {
      this.resource('tasks', function() {
        this.route('show', { path: ':id'});
        this.route('new');
        this.route('edit');
      });
    });
    this.route('edit', { path: ':project_id/edit'});
    this.route('new');
  });
});