title: Sequelize belongsTo and include
body: <p>I am having a hard time making use of BelongsTo relationship in a query.</p>
  
  <p>Here is the relationship:</p>
  
  <pre><code>models.Area.hasMany(models.Airport);
  models.Airport.belongsTo(models.Area, {foreignKey: 'areaId', as: 'area'});
  </code></pre>
  
  <p>Now I try to run a query:</p>
  
  <pre><code>models.Airport
      .findAll( {
          where: { active: 1 },
          include: { model: models.Area }
          })
  </code></pre>
  
  <p>I get an error:</p>
  
  <pre><code>   Error: area is not associated to airport!
  </code></pre>
  
  <p>What am I doing wrong?</p>