app_routes_album.js

import Ember from 'ember';
import Ember from 'ember';

export default Ember.Route.extend({
  isEditing: true,

  model(params) {
    return this.get('store').findRecord('album', params.album_id);
  },

  actions: {
    toggleEdit() {
      this.toggleProperty('isEditing');
      Ember.Logger.debug('toggle isEditing: ', this.getProperties('isEditing')['isEditing']);
    }
  }
});

app_templates_album.hbs

  <button {{action "toggleEdit" this}} class="btn btn-secondary">
    <i class="fa fa-pencil" aria-hidden="true"></i>
  </button>
      
<div class="row">
    {{#each model.images as |image|}}
      <div class="card">
        <img src="http://localhost:9393/i/{{image.id}}" style="height: 280px; width: 100%; display: block;"/>
        {{#if isEditing}}
          {{input type="text" value=image.title class="card-text"}}
        {{else}}
          <p class="card-text">{{image.title}}</p>
        {{/if}}
      </div>
    {{/each}}
</div>