code: function(model_s, options){
        var toRemove = model_s instanceof Array ? model_s : [model_s];
  
        ko.utils.arrayForEach(toRemove, function(model){
          model.destroy(options);
        });
      }
docs: Remove one or more models from the colection and destroy them on the server if saved It simply calls model.destroy() on each model is passed to it Options for the sync method can be passed as an object