title: Is there a way to pass custom data in .then part of Promises?
body: <p>I'm really new to promises (I'm using bluebird promises with expressjs). I like how they tidy up the code. However, I'm not quite sure how to use them in some scenarios. I'm not even sure I'm using them right in my example.</p>
  
  <p>The issue I have is that I'd like to pass some truthy or falsy to ".then" part of the promise. I've commented the code below for further details.</p>
  
  <p>Thank you in advance!</p>
  
  <pre><code>//data is an array of javascript objects
  Promise.each(data, function(d){
      delete d.offset;
      if (d.driver_id == -1) d.driver_id = null;  
  
      Promise.try(function(){
          return new Term().where({'date_of_driving': d.date_of_driving}).fetch()
      })
      .then(function(result){
  
          d.updated_at = dater.formatDate(new Date(), true);
          if (result !== null) {
              //update
              var res = result.toJSON();
              return new Term({'id': res.id}).save(d);
          } else {
              //save
              d.created_at = dater.formatDate(new Date(), true);
              return new Term().save(d);               
          }
      }).then(function(item){
              //I need to know here if before I saved or updated Term record
              //is there a way to pass a truthy or falsy variable?
      })
  })
  .then(function(terms){
  
  })
  .catch(function(error){
      callback(false);
  });
  </code></pre>