gistfile1.js

Handlebars.registerHelper("can", function(actor, action, object, fn)
{
  var context = (fn.contexts && fn.contexts[0]) || this;


  var canAction = function(can_args)
  {
    var rules = context.container.lookup('rules:eval');

    return rules.can({activity: can_args[1], actor: can_args[0], object: can_args[2] });

  };

  var args = [actor, action ,object, fn];
  var options   = args.pop();

  // Gather all bound property names to pass in order to observe them
  var properties = options.types.reduce(function(results, type, index) {
    if (type === 'ID') {
      results.push(args[index]);
    }
    return results;
  }, []);


 // Resolve actual values for all params to pass to the conditional callback
  var normalizer = function() {
    return Ember.Handlebars.resolveParams(context, args, options);
  };
 
  return Ember.Handlebars.bind.call(context, 'content', options, true, canAction, normalizer, properties );
});