Passing Parameters to sails.js policies

Question

Sails.js (0.9v) controllers have policies defined as:

RabbitController: {

    '*': false, 

    nurture    : 'isRabbitMother',

    feed : ['isNiceToAnimals', 'hasRabbitFood']
}

is there a way to pass params to these acls eg:

RabbitController: {

    '*': false, 

    nurture    : 'isRabbitMother(myparam)',

    feed : ['isNiceToAnimals(myparam1, myparam2)', 'hasRabbitFood(anotherParam)']
}

This may lead to multiple use of these functions for different params. Thanks Arif

Answer 1

The policies are middleware functions with the signature:

    function myPolicy (req, res, next)

There's no way to specify additional parameters for these functions. However, you could create wrapper functions to create the policies dynamically:

    function policyMaker (myArg) {
      return function (req, res, next) {
        if (req.params('someParam') == myArg) {
          return next();
        } else {
          return res.forbidden();
        }
      }
    }

    module.exports = {

      RabbitController: {
        // create a policy for the nurture action
        nurture: policyMaker('foo'),
        // use the policy at 
        // /api/policies/someOtherPolicy.js for the feed action
        feed: 'someOtherPolicy'
      }

    }

In practice you'd want to separate this code into another file and require it, but this should get you started.