gistfile1.txt

var YourModel = Backbone.Collection.extend({
  beforeDestroy:function () {
    if (/*someLogic*/) {
      this.destroy();
    }
  },
})

var YourCollection = Backbone.Collection.extend({
  model: YourModel,
  initialize: function () {
    this.on('destroy', function (model) {
      // after destroy
    });
  }
});