data mapping component

components.example-form.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'form'
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  model: [
    {input1: 'test 1a', input2: 'test 1b'},
    {input1: 'test 2a', input2: 'test 2b'}
  ],
  
  actions: {
    add() {
      let length = this.get('model').length;

      this.get('model').addObject({
        input1: `test ${length + 1}a`,
        input2: `test ${length + 1}b`
      })
    }
  }
});

styles.app.css

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

form {
  border: 1px solid #ccc;
}

form + form {
  margin-top: 1rem;
}

templates.application.hbs

<button type="button" onclick={{action "add"}}>Add</button>

<hr>

{{#each model as |item|}}
  {{example-form item=item}}
{{/each}}

templates.components.example-form.hbs

<div>
  <input value={{item.input1}}>
</div>
<div>
  <input value={{item.input2}}>
</div>

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"
  }
}