Ember - Issue with HTTP POST request

I am new to Ember (among other things!). I have written a (very) simple RESTFul Web service to retrieve data from MongoDB using Node, Express and Mongoose.

On the server side, I have this code:

router.route('/products').post(function(req,res){
    var product = new Product(req.body);
    product.save(function(err){
    if(err)
        res.send(err);
    res.send({message:'Product Added'});
});

When I submit a request from my Ember client, the req.body contains something like the following:

{ attributes: 
   { category: 1,
     name: 'y',
     price: 1,
     active: false,
     notes: null } }

The attribute names are exactly the same as my mongoose schema. I get no error but the document created in MongoDB is empty (just get the _id and __v fields).

What am I doing wrong. Should I convert the req.body further into ??? Can you guys help me out?

Thanks.