code: function (fullName) {
        if (this.resolver && this.resolver.lookupDescription) {
          return this.resolver.lookupDescription(fullName);
        } else if (this.fallback) {
          return this.fallback.describe(fullName);
        } else {
          return fullName;
        }
      }
docs: A hook that can be used to describe how the resolver will
  attempt to find the factory.
  For example, the default Ember `.describe` returns the full
  class name (including namespace) where Ember's resolver expects
  to find the `fullName`.
  @private
  @method describe
  @param {String} fullName
  @return {string} described fullName