Simple method to remove all the documents from a collection. This adds a new truncate method to the Meteor.Collection prototype. The term "truncate" is taken from a similar TSQL operation "truncate". See http://dev.mysql.com/doc/refman/5.0/en/truncate-table.html

Meteor.Collection.truncate.coffee

/**
 * Removes all documents from the collection
 * @example testCollection = new Meteor.Collection('test')
 * 	    testCollection.truncate
 */

Meteor.Collection.prototype.truncate = ->
	@find().forEach (item) =>
		@remove item._id

Converted to JS using http://js2coffee.org/ - hope you don't mind.

Meteor.Collection.prototype.truncate = function() {
  return this.find().forEach((function(_this) {
    return function(item) {
      return _this.remove(item._id);
    };
  })(this));
};