New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    import: function(item) {
      console.log('Making API call', item);
      item.set('isProcessing', true);
    }
  }
});

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return [Ember.Object.create({name: 'red'}), Ember.Object.create({name: 'yellow'}), Ember.Object.create({name: 'blue'})];
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<ul>
  {{#each model as |item|}}
    {{item-row thing=item.name import=(action "import" item)}}
    {{#if item.isProcessing}}
      <span>Spin Me</span>
    {{/if}}
  {{/each}}
</ul>

item-row.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'li',
  actions: {
    import: function() {
      this.get('import')();
    }
  }
});

item-row.template.hbs

{{thing}}
<button {{action 'import'}}>Click me!</button>

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}