Mixin: PagedModel

Extracts header paging information into the $page and $pageCount properties.

Usage:

Just add mixin to a model's mixin chain

var Bike = restmod.model('api/bikes', 'PagedModel');

Then using fetch on a collection bound to a paged api should provide page information

Bike.$search().$then(function() {
  console.log this.$page; // should print the current page number.
  console.log this.$pageCount; // should print the request total page count.
});

Paging information is extracted from the 'X-Page' and the 'X-Page-Total' headers, to use different headers just override the $pageHeader or the $pageCountHeader definition during model building.

restmod.model('PagedModel', function() {
 this.define('$pageHeader', 'X-My-Page-Header');
})