gistfile1.js

Todos.tasksController = SC.ArrayController.create(
  SC.CollectionViewDelegate,
/** @scope Todos.tasksController.prototype */ {

  summary: function() {
    var len = this.get("length"), ret;
    
    if (len && len > 0) {
      ret = len === 1 ? "1 tasks" : "%@ tasks".fmt(len);
    } else {
      ret = "No tasks";
    }
    
    return ret;
  }.property("length").cacheable(),
  
  collectionViewDeleteContent: function(view, content, indexes) {
    var records = indexes.map(function(idx) {
      return this.objectAt(idx);
    }, this);
    records.invoke("destroy");
    
    var selIndex = indexes.get("min") - 1;
    if (selIndex < 0) selIndex = 0;
    var obj = this.objectAt(selIndex);
    this.selectObject(obj);
  }

}) ;