Policy

Helper for a standardized form of Policy Object inspired by the Code Climate Blog. Designed to be used in the Node environment.

Usage

var ActiveUserPolicy = BasePolicy.extend({
  allowed: function(user) {
    return user.emailConfirmed? && 
      user.lastLoggedInAt > moment().subtract(14, 'days');
  }
});

function emailAllowedUsers(users, policy) {
  users.forEach(function(user) {
    if (policy.allowed(user)) {
      sendEmail(user);
    }
  });
};

emailAllowedUsers(users, ActiveUserPolicy.create());

It can also work at the 'class' level:

var ActiveUserPolicy = BasePolicy.extend({
  allowed: function(user) {
    return user.emailConfirmed? && 
      user.lastLoggedInAt > moment().subtract(14, 'days');
  }
});

ActiveUserPolicy.allowed(user) // => true or false

It also accepts arguments in the constructor:

var ActiveUserPolicy = BasePolicy.extend({
  init: function(daysAgo) {
    this.daysAgo = daysAgo;
  },

  allowed: function(user) {
    return user.emailConfirmed? && 
      user.lastLoggedInAt > moment().subtract(this.daysAgo, 'days');
  }
});