node.js - Migrating Express.js 2 to 3, specifically app.dynamicHelpers() to app.locals.use?

Question

Updated Express.js from version 2 to 3, and the following call to app.dynamicHelpers({..}) broke as it is no longer present in V3:

app.dynamicHelpers({

    request: function(req){
      return req
    },
    ...etc.
});

There's a migration guide which says this:

• app.dynamicHelpers() (use middleware + res.locals)

But I'm stumped how to do that. Is there a more concrete example of how to migrate that?

Related SO post: nodejs express 3.0

Answer 1

I had the same problem with session.user and just fixed it by understanding that the app.use function needs to be IN the configure part, not where it was before.

Before:

app.configure();
app.dynamicHelpers({
  user: function(req, res) {
    return req.session.user;
  }
});

After:

app.configure(function(){
  //...
  app.use(function(req, res, next){
    res.locals.user = req.session.user;
    next();
  });
  //...
});

for Flash have a look at connect-flash