title: I can't establish a simple association on Sails.js (relation model's field shows undefined)
body: <p>I've been trying a simple 'one way association' on v0.9.16 and later v.10.0.rc8. 
  I'm guessing, I'm doing something wrong.
  I have two collections on my MongoDB and I have two models and a controller such as following;</p>
  
  <p>my User.js file;</p>
  
  <pre><code>module.exports = {
  
    connection: 'mongo',
  
    attributes: {
  
      username: {
          type: 'string',
          required: true
      },
  
      encryptedPassword: {
          type: 'string' , 
          required: true
      },
  
      //one way association
      personel: {
        model: 'Personel'
      }  
  
    }
  };
  </code></pre>
  
  <p>my Personel.js file;</p>
  
  <pre><code>module.exports = {
  
    connection: 'mongo',
  
    attributes: {
        name: 'string',
        phone: {
            mobile: 'string',
            office: 'string'
        },
        email: 'string',
        gender: 'string'
        department: {
            department_id: 'integer',
            department_name: 'string'
        },
        title: {
            title_id: 'integer',
            title_name: 'string'
        }
    }
  };
  </code></pre>
  
  <p>my UserController.js file;</p>
  
  <pre><code>module.exports = {
  show : function (req, res) {
  User
  .findOne(req.param('id'))
  .populate('personel')
  .exec(function(err, user) {
  console.log(user);
  });
  
  }
  </code></pre>
  
  <p>Console writes 'undefined' for personel field;</p>
  
  <pre><code>{ username: 'jkidd',
  personel_id: '1',
  personel: undefined }
  </code></pre>
  
  <h2>Edit</h2>
  
  <p>To provide association I've just added following codes to my User model</p>
  
  <pre><code>//one way association
  personel: {
    model: 'Personel'
  }  
  </code></pre>
  
  <p>and I'm trying to </p>
  
  <pre><code>show : function (req, res) {
     User
      .findOne(req.param('id'))
      .populate('personel')
      .exec(function(err, user) {
        if(err) return res.json(err, 400);
        if(!user) return res.json({ error: 'No User with that Id' }, 404);
  
        console.log(user);
  
        res.view({
          user : user
        });
      });            
  }
  </code></pre>