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controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

controllers.index.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['foo'],
  foo: 0,
  newFoo: function() {
    return parseInt(this.get('foo'))+1;
  }.property('foo')
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    willTransition: function(transition){
      console.log('IM TRANSITIONING...');
      if (transition.queryParams.foo > 1) {
        console.log('ABORT');
        transition.abort();
      }
    }
  }
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  queryParams: {
    foo: {
      refreshModel: true
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.index.hbs

  {{#link-to "index" (query-params foo=newFoo)}}Go to {{newFoo}}{{/link-to}}
  {{fooControllerProp}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}