code: function setModel(Model, modelName) {
      let authConfigs;
      if (!internals.acl) {
          throw new Error('Attempt to shield model before setting acl');
      }
  
      if (!internals.authConfig.length) {
          throw new Error('Attempt to shield model before seting configs');
      }
  
      // raise shield around Model
      new Shield(Model, internals.acl);
      authConfigs = getAuthConfigs(modelName);
      _.each(authConfigs, _.bind(Model.shield.addRules, Model.shield));
      internals.models[modelName] = Model;
  }
docs: Set an individual model on the internal scope after wrapping it with a shield
  @param {bookshelfModel} Model is a bookshelf Model constructor
  @return null;