Steps to invoke another service (function) prior to calling the res.view() function in sails JS:

Question

Steps to invoke another service (function) prior to calling the res.view() function in sails JS:

I am looking to execute a separate function, like a Service function, before Sails renders the page into HTML. Please refer to the controller code below...

var MYController = {
   index: function(req, res, next) {

      req.flash("error", "Testing hello world"); 
      MyCustomServices.myFunction( req, res );
      res.view();
   }
}

To include my service function, check api/services/MyCustomServices.js

exports.myFunction = function( req, res ){
   Test.findOne({ code : "CODE" }, function(err, resp) {
        if ( resp ) {
            res.locals.TEST = resp;
        }
   });

   var msg = req.flash('error');
   res.locals.ERROR = msg.length>0 ? msg : "" ;

};

In this case, there is an additional process that needs to run before res.view() when calling MyCustomServices.myFunction( req, res );

The issue is that every time I call the res.view() function, I have to add this line in all my controller actions.

I attempted to add MyCustomServices.myFunction( req, res ); in express.js, but it didn't work as expected. It seems like it should be in express, but I'm not sure what codes are needed to be added.

The tasks performed by MyCustomServices.myFunction( req, res ) include:

Fetching data from MongoDB using a query to Sails.
Parsing req.flash messages to pass them to views for display.

Does anyone have ideas on how to resolve this?

javascript mongodb express sails.js

Answer 1

Answer №1

If your Service completion triggers the need to use res.view, one possible solution is to eliminate res.view from the controller and integrate it directly into the service:

var MYController = {
  index: function(req, res, next) {
    req.flash("error", "Testing hello world"); 
    MyCustomServices.myFunction( req, res );
    //res.view();
  }
}

exports.myFunction = function( req, res ){
   Test.findOne({ code : "CODE" }, function(err, resp) {
        if ( resp ) {
            res.locals.TEST = resp;
            res.view(); //TADA
        }else {
            /* Handle Error */
        }
   });

   var msg = req.flash('error');
   res.locals.ERROR = msg.length>0 ? msg : "" ;

};

Answer 2

If your Service completion triggers the need to use res.view, one possible solution is to eliminate res.view from the controller and integrate it directly into the service:

var MYController = {
  index: function(req, res, next) {
    req.flash("error", "Testing hello world"); 
    MyCustomServices.myFunction( req, res );
    //res.view();
  }
}

exports.myFunction = function( req, res ){
   Test.findOne({ code : "CODE" }, function(err, resp) {
        if ( resp ) {
            res.locals.TEST = resp;
            res.view(); //TADA
        }else {
            /* Handle Error */
        }
   });

   var msg = req.flash('error');
   res.locals.ERROR = msg.length>0 ? msg : "" ;

};

Answer 3

Answer №2

Two Possible Choices

Incorporate a callback into your service for added functionality

var NewController = {
   display: function(request, response, next) {

      request.flash("error", "Testing hello world"); 
      MyCustomServices.myFunction( request, response, function(){
          return  response.view();
      } );

   }
}

exports.myFunction = function( request, response, callback ){
   Test.findOne({ identifier : "IDENTIFIER" }, function(error, result) {
        if ( result ) {
            response.locals.DATA = result;
            return callback()
        }
   });

};

-- or (as suggested in your feedback) --

You have the option to implement a custom response handler in your application. Visit for more information.

You may substitute res.view() with res.ok() and adjust api/responses/ok.js according to your requirements.

If you prefer not to modify ok.js, you can create your own customized response instead.

Answer 4

Two Possible Choices

Incorporate a callback into your service for added functionality

var NewController = {
   display: function(request, response, next) {

      request.flash("error", "Testing hello world"); 
      MyCustomServices.myFunction( request, response, function(){
          return  response.view();
      } );

   }
}

exports.myFunction = function( request, response, callback ){
   Test.findOne({ identifier : "IDENTIFIER" }, function(error, result) {
        if ( result ) {
            response.locals.DATA = result;
            return callback()
        }
   });

};

-- or (as suggested in your feedback) --

You have the option to implement a custom response handler in your application. Visit for more information.

You may substitute res.view() with res.ok() and adjust api/responses/ok.js according to your requirements.

If you prefer not to modify ok.js, you can create your own customized response instead.

Steps to invoke another service (function) prior to calling the res.view() function in sails JS:

Answer №1

Answer №2

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