I want to update a MongoDB docment (using the Javascript db driver). I would like to pass in a JSON object and have that update the document ... something like:

Provider.prototype.updateProfile = function(username, profile, callback) {

  this.getCollection(function(error, profile_collection) {

    if( error ) callback( error );

    else {

      profile_collection.update(

        {username: username},

        {profile},

        function(error, profile){

          if( error ) callback(error);

          else callback(null, profile)

        });

    }

  });

};

I want this to be a generic function, so that if the document structure changes I don`t have to re-write. At the moment I can only get this working by using

{$set: {x:profile.x, y:profile.y}}

in the update, does anyone have a generic solutions so that I can pass in any profile:

profile = { .... }