[Code/Racer: Middleware]

In our last video, we saved the information from Facebook to our local database.

Now, let's go ahead and move that logic into a middleware.

Instead of doing if req.session.userid every single time we want to see if a user is logged in,

we can go ahead and create a middleware that will check on that for us.

We do that over here in our Application Definition.

I'm going to change the placement of these commas around very slightly

to make it easier to view.

In order to create a middleware, we do it right here inside of the express stack.

We send in the request, the response, and a callback called "next."

That will get called after the middleware has run.

What we'll do is check to see if there's a user id key inside of the session.

If there is, we'll find the user,

and we'll set a loggedIn variable inside of the request.

Then all we have to do is called req.loggedIn.

Then we call next to go back up the stack.

If there is no user, we set loggedIn to "False."

Finally, we need to do something in the event that there is no user ID in the session at all.

Now what we can do is change this down here in our "me" endpoint

to say if we're logged in.

All we have to do is render the template "me.eco" with our request user.

If not, we just redirect to the homepage.

Now we should see the exact same thing we saw last time

before we extracted it to a middleware, and we do, which is exactly what we want.

Finally, just for fun, let's go ahead and display our profile picture.

We do this inside of the instance methods.

We'll call this method avatar_url,

which is really just a link to Facebook.

Now let's display it inside of our view.

Right now we just have a link to the picture.

Let's go ahead and put it inside of an image tag.

And there we go.

In this video, we learned how to extract logic into a middleware,

thereby cleaning up our methods.