javascript - How to initialise a BackboneJS model that has no defaults? -

i've found myself doing lot of these, instance:

var item = backbone.model.extend({  });  var sampleitemcode = 12345;  var item = new item({itemcode: sampleitemcode}); 

i have no defaults of attributes want set, , yet want make own model. looks weird have empty backbone.model that, i'm wondering if there way initialise it?

better have this.

var item = backbone.model.extend({         defaults: {itemcode: -1} }); 

itemcode definite need item. default it. when write functions inside item model, you'll have itemcode , can check against it. , when fetch data server collection , if item don't have itemcode or when initialize item , if failed set itemcode, it'll have it's default.

for example, if adding new item collection. can this.

collection.push(new item({name: "item 56", price: 1500})); 

here don't need pass itemcode: -1 on each time. it'll defaulted , when save, in server, can check itemcode , if -1, can consider new item add.

but nothing wrong have did. you'll surely add functions model when extend app.