AriaTemplates singleton utility to help with safely getting nested properties from the data model.

Model.js

/**
 * Data model utility functions
 */
Aria.classDefinition({
  $classpath : 'utils.Model',
  $singleton : true,
  $prototype : {
    /**
     * Safely try to get the value of a nested property of an object. If it is not found, return the default value
     * instead. This could be useful in some cases when looking up values in a big data model, however if it doesn't
     * find the property, it is not going to tell you which of the part of the chain failed, so if this information is
     * important to you, don't use this function
     * @param {Object} model A javascript object
     * @param {String} path The full path to access the property, e.g. 'inbound.flight.type.destination'
     * @param {Object} def The default to return in case the property does not exist. This can be any type
     * @return {Object} The value of the property if found or the default value otherwise
     */
    get : function (model, path, def) {
      path = path || '';
      model = model || {};
      def = def || '';
      var parts = path.split('.');
      if (parts.length > 1 && typeof model[parts[0]] === 'object') {
        return this.get(model[parts[0]], parts.splice(1).join('.'), def);
      } else {
        return model[parts[0]] || def;
      }
    }
  }
});