text: var ghostBookshelf = require('./base'),
      User           = require('./user').User,
      Role           = require('./role').Role,
      App            = require('./app').App,
  
      Permission,
      Permissions;
  
  Permission = ghostBookshelf.Model.extend({
  
      tableName: 'permissions',
  
      roles: function () {
          return this.belongsToMany(Role);
      },
  
      users: function () {
          return this.belongsToMany(User);
      },
  
      apps: function () {
          return this.belongsToMany(App);
      }
  }, {
      /**
      * Returns an array of keys permitted in a method's `options` hash, depending on the current method.
      * @param {String} methodName The name of the method to check valid options for.
      * @return {Array} Keys allowed in the `options` hash of the model's method.
      */
      permittedOptions: function (methodName) {
          var options = ghostBookshelf.Model.permittedOptions(),
  
              // whitelists for the `options` hash argument on methods, by method name.
              // these are the only options that can be passed to Bookshelf / Knex.
              validOptions = {
                  add: ['user']
              };
  
          if (validOptions[methodName]) {
              options = options.concat(validOptions[methodName]);
          }
  
          return options;
      },
  });
  
  Permissions = ghostBookshelf.Collection.extend({
      model: Permission
  });
  
  module.exports = {
      Permission: Permission,
      Permissions: Permissions
  };
  