modal-message component pattern - part of post: https://medium.com/p/dc024bfa203c

application.hbs

<!--- ... --->
{{#if isShowingModal}}
  {{modal-message
    close=(route-action 'closeModalDialog')
    options=modalOptions}}
{{/if}}
<!--- ... --->

modal-message-component.js

import Ember from 'ember';

const {
  Component,
  get,
  set,
  computed
} = Ember;

export default Component.extend({
  mainActionText: 'Ok',
  mainActionPendingText: 'Ok',
  secondActionText: 'Cancelar',
  secondActionPendingText: 'Cancelar',

  didReceiveAttrs() {
    set(this, 'mainAction', get(this, 'close'));
    set(this, 'secondAction', get(this, 'close'));
    this.setProperties(get(this, 'options') || {});
  },

  showInput: computed('type', function() {
    return get(this, 'type') === 'prompt';
  }),

  showCancel: computed('type', function() {
    const type = get(this, 'type');
    return type && type !== 'alert';
  }),

  actions: {
    triggerMainAction() {
      const mainAction = get(this, 'mainAction');
      const type = get(this, 'type');

      if(type === 'prompt') {
        mainAction(get(this, 'prompt'));
      } else if(type === 'confirm') {
        mainAction(true);
      }

      return get(this, 'close')();
    }
  }
});

modal-message-template.hbs

{{#modal-dialog close=close targetAttachment="center"}}
  <div class="form-group">
    {{#if title}}
      <h3>{{title}}</h3>
    {{/if}}

    {{#if label}}
      <div>{{label}}</div>
    {{/if}}

    {{#if showInput}}
      <div class="col-md-12">
        {{input value=prompt
          data-autoid="modal-prompt-input"
          class="form-control small"}}
      </div>
    {{/if}}
  </div>

  {{#if showCancel}}
    {{async-button default=secondActionText
      action=secondAction
      class="btn btn-xs"
      data-autoid="modal-second-action"
      pending=secondActionPendingText}}
  {{/if}}

  {{async-button default=mainActionText
    action="triggerMainAction"
    class="btn btn-xs btn-secondary submit"
    data-autoid="modal-main-action-submit"
    pending=mainActionPendingText}}
{{/modal-dialog}}