component cache state

components.tweet-message.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: 'tweet-message',
  isDone: false,
  
  actions: {
    reTweet() {
      this.set('isDone', true);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  model: [
    { text: 'Hello World' },
    { text: 'Foo Bar' },
    { text: 'Ember Rocks' }
  ]
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.tweet-message {
  margin-bottom: 15px;
}

.tweet-message .message-text {
  display: inline-block;
  margin-right: 10px;
}

templates.application.hbs

<h1>Welcome to Tweet Example</h1>

{{#each model as |tweet|}}
  {{#tweet-message tweet=tweet as |tweetHelper|}}
    <span class="message-text">{{tweet.text}}</span>
    <button class="btn btn-default" {{action "reTweet" target=tweetHelper}} disabled={{tweetHelper.isDone}}>Retweet</button>
  {{/tweet-message}}
{{/each}}

templates.components.tweet-message.hbs

{{yield this}}

twiddle.json

{
  "version": "0.4.17",
  "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/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}