Dealing with errors in Express.js using promises and the suncc middleware

Question

Dealing with errors in Express.js using promises and the suncc middleware

Dealing with both sync errors and promise errors in the same code can be tricky. Below is an example of how I'm attempting to handle them, but I'm unsure if it's functioning correctly. Any suggestions are appreciated.

helpers.list({
            limit: 1
        })
        .then(function(results) {
          // Handle cases where there are no results
          if (results.length < 1) {
            return next();
          }
            res.render('post/post');
        })
         .fail(function(error){
           next(error);
        })

express error-handling es6-promise parse-server

Answer 1

Answer №1

Avoid mixing sync errors with promises

I have come across a reliable solution which involves throwing a rejected promise so that the `fail()` function can catch it towards the end

helpers.list({
            limit: 1
        })
        .then(function(results) {
          // Take care of scenarios where there are no results
          if (results.length < 1) {
           // Call next to proceed to the next route, for example 404
           next();
            return Parse.Promise.reject('No results were found')
          }
            res.render('post/post');
        })
         .fail(function(error){

           // Use call next(error); to trigger the express error handler
        })

Answer 2

Avoid mixing sync errors with promises

I have come across a reliable solution which involves throwing a rejected promise so that the `fail()` function can catch it towards the end

helpers.list({
            limit: 1
        })
        .then(function(results) {
          // Take care of scenarios where there are no results
          if (results.length < 1) {
           // Call next to proceed to the next route, for example 404
           next();
            return Parse.Promise.reject('No results were found')
          }
            res.render('post/post');
        })
         .fail(function(error){

           // Use call next(error); to trigger the express error handler
        })

Dealing with errors in Express.js using promises and the suncc middleware

Answer №1

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