paged_controller.js

export default Controller.extend({
  actions: {
    incrementPage() {
      let page =  this.get('page');
      let max = this.get('products.meta.total_pages');
      if (page < max) {
        this.set('page', page + 1);
      }
     },
     decrementPage() {
      let page =  this.get('page');
      if (page > 2) {
        this.set('page', page - 1);
      }
    }
  }
});