Sails blueprints lifecycle

Question

I need to add some additional data to result of find blueprint. I found this solution:

module.exports = {
  find: function(req, res) {
    return sails.hooks.blueprints.middleware.find(req, res);
  }
}

but I can`t find any way to change response here, or add callback into the blueprint. I even try to change blueprint and add the cb in it:

module.exports = function findRecords (req, res, cb) { 
  ...
  if (typeof cb === 'function') res.ok(cb(result));
  else res.ok(result);

but in this case it returns 500 statusCode every time (but with corresponding data)

Suppliant

What is it you want to achieve? Do you want to add data to response or to headers? Why are you adding a callback? – Rebarbative

@zabware I want to add statistic info (count for associated table) to the results of blueprints. I need this in several controllers, so just copy/paste code from find blueprint isn`t really good. – Suppliant

To populate info from an associated table is easy. First: verify that the table are really associated (example: models/Article.js: module.exports.attributes { ..., user = {model: 'User'}}) Second: make sure sails.config.blueprints.populate is set to true. sailsjs.com/documentation/reference/blueprint-api/… – Urogenous

Answer 1

I have been struggling with the same issue for a couple of time. Here is my hack (with explanation) to solve this.

The build in blueprint will always make a call to res.ok, res.notFound, or res.serverError if an error occurs. With altering of this method calls, it is possible to modify the output.

/** 
 * Lets expose our own variant of `find` in one of my controllers
 * (Code below has been inserted into each controller where this behaviour is needed..)
 */
module.exports.find = function (req, res) {

    const override = {};
    override.serverError = res.serverError;
    override.notFound = res.notFound;
    override.ok = function (data) {

        console.log('overriding default sails.ok() response.');
        console.log('Here is our data', data);

        if (Array.isArray(data)) {
            // Normally an array is fetched from the blueprint routes
            async.map(data, function(record, cb){

                // do whatever you would like to each record
                record.foo = 'bar';
                return cb(null, record);

            }, function(err, result){
                if (err) return res.error(err);
                return res.ok(result);
            });
        }
        else if (data){
            // blueprint `find/:id` will only return one record (not an array)
            data.foo = 'bar';
            return res.ok(data);
        }
        else {
            // Oh no - no results!
            return res.notFound();
        }
    };

    return sails.hooks.blueprints.middleware.find(req, override);
};

Urogenous

Thanx. Can I override ok method directly in res? res.ok = function (data) {...}; return sails.hooks.blueprints.middleware.find(req, res); – Suppliant

Yes @Crusader, this sounds like a better idea! This way any other dependencies on the res-object will still work. (But I havn't actually tested your proposal.) – Urogenous

Where do you put this file? – Airedale

Directly into the controller @Airedale (together will all the other exports). – Urogenous

Answer 2

Seems like only copy-paste solution existed. So I copy all code from files in node_modules/sails/lib/hooks/blueprints/actions to the actions of every controller and then change it.

Suppliant