Handlebars doesn't seem to call my controller function

I have a property on my controller, isLogin, bound to a handlebars conditional, {{#unless isLogin}}. But it doesn't seem to activate the function when the template is rendered. I inserted a console.log statement and that doesn't show up in the console either.

I have an application template like this:

<div id="header">
  <div class="screen-line black"></div>
</div>
<div id="content">
  <div class="pure-g">
    <div class="pure-u-1-6">
      {{#unless isLogin}}
        <div class="nav pure-menu custom-restricted-width">
          <ul class="pure-menu-list">
            <li class="pure-menu-item"><div class="menu-item-icon fa fa-trello"></div>{{link-to "Classrooms" "classrooms" class="menu-item pure-menu-link"}}</li>
          </ul>
        </div>
      {{/unless}}
    </div>
    <div class="pure-u-5-6" >
      {{outlet}}
    </div>
  </div>
</div>
<div id="footer">
  <div class="screen-line black"></div>
</div>

And a controller like this:

import Ember from 'ember';

export default Ember.Controller.extend({
  isLogin : function(){
    console.log("isLogin called");
    return true;
  }

});

Can you see what is wrong? Thanks