Trigger a 404 from within view

Is there a way to pass an error out of a view to be handled by the default handlers in Keystone? What I was hoping to do was pass along a 404 if a query returned no results. Passing an error to next() doesn’t stop the view from rendering.

var keystone = require('keystone');

exports = module.exports = function(req, res) {

var view = new keystone.View(req, res),
locals = res.locals;

// locals.section is used to set the currently selected
// item in the header navigation.
locals.section = 'serviceareas';

view.on('init', function(next){

    var q =  keystone.list('ServiceArea').model.find().sort('sortOrder');
    q.exec(function(err, result){
        if(err) next(err);
        if(result.length === 0){
            var notfound = new Error();
            notfound.status = 404;
            next(notfound); // any error I pass to next() doesn't stop the render call
        } else {
            locals.serviceareas = result;
            next();
        }

    });
})

// Render the view
view.render('index');

};

[albertogasparin]

I think this is what you are looking for:

if (result.length === 0) {
  return res.status(404).send(keystone.wrapHTMLError('Sorry, no page could be found at this address (404)'));
}

keystone.wrapHTMLError is a method that generates a string of the default error page. In addition, you can pass any number to status() and any string as send argument. I prefer a “Not found” string and then let nginx do the error page rendering.

On a final note, the res object is quite powerful. You can also handle dynamic redirects like:

if (result.length === 0) {
  return res.status(301).redirect('/');
}

[gautamsi]

Keystone 4 is going in maintenance mode. Expect no major change. see #4913 for details.

@albertogasparin’s comment is the best solution/workaround for v4.