ember static filter with query params

I have a list of posts and I need filter by social_network, I'm using query params to filter, my question is how temporary filter the model so that later I can come back to show all

route posts.index with:

model(params) {
    return this.store.find('post');
  }

and also a controller for it:

export default Ember.ArrayController.extend({
  queryParams: ['social_network'],
  social_network: 'all',

  paramsDidChange: function() {
    var network = this.get('social_network');
    var posts = this.get('model');

    if(network === 'all') {
      return posts;
    }
    return posts.filterBy('social_network', network);
  }.observes('social_network', 'model'),
});

view:

{{#each post in model}}
    <li>
      {{post-index post=post}}
    </li>
  {{/each}}