Many to Many relationship Issue

Hello. I am enjoying Vokuro and have been trying some things using it as a base on my own, just to get used to the framework. I am enjoying it quite a lot. I have added a couple more tables and thus models on my own. I added a Communities model and am joining that to the Users model by means of a join table, CommunityUsers. I have created a model for this as well and have set up the relationships as recommended by the docs and other posts in the forums. However, while I can pull Users communities, I cannot pull results from Communities to get Community Users. So the relationship seems to only work one way -> from Users.

Here's the Communities model code:

    <?php
    namespace Vokuro\Models;
    use Phalcon\Mvc\Model;

    class Communities extends Model
    {
    ...
    public function initalize(){
        $this->hasManyToMany(
            "id",
            "Vokuro\Models\CommunityUsers",
            "community_id", "user_id", 
            "Vokuro\Models\Users",
            "id",
            array('alias' => 'users')
        );
        $this->belongsTo("client_id", "Clients", "id");
    }
    }

And here's my linked CommunityUsers Model:

    <?php
    namespace Vokuro\Models;
    use Phalcon\Mvc\Model;

    class CommunityUsers extends Model
    {
    public function initialize()
    {
        $this->setSource('community_users');

        $this->belongsTo('community_id', 'Vokuro\Models\Communities', 'id', array(
            'alias' => 'community'
        ));

        $this->belongsTo('user_id', 'Vokuro\Models\Users', 'id', array(
            'alias' => 'users'
        ));
    }
    }

And finally, the Users (abbreviated model only association shown):

    <?php
      $this->hasManyToMany(
            "id",
            "Vokuro\Models\CommunityUsers",
            "user_id", "community_id", 
            "Vokuro\Models\Communities",
            "id",
            array('alias' => 'communities')
        );

And the client code from the controller throwing the error (note the users call works fine, not the communities):

    <?php
    public function testAction(){
        $users = Users::find();
        foreach($users as $user){
            $communities = $user->communities;
            foreach($communities as $community){
                echo $community->c_name;
            }

        }

        $communities = Communities::find();
        foreach($communities as $community){
            $users = $community->users;
            foreach($users as $user){
                echo $user->name;
            }

        }
        die();
    }