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Welcome back.

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So this video is going to be pretty quick.

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I'm going to show you something called modules on exports which is going to help us clean up our code

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and make it more modular.

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And then I'll show you how we can use module but exports to clean up the code that we just wrote which

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is the reference is genius.

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File this one here.

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Currently it's a long file that has our mongoose code up top.

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Then we have the post schema and model and then the user schema and model and then all of our subsequent

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code where we're using those models what we're going to do is break this out into separate files.

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So the post code here all the stuff to make the schema in the model will be its own file that we can

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require just like we are requiring mongoose here.

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We can do the same thing.

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It won't work just yet.

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But we can do something like var post equals require.

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And then we'll have post-up.

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Yes that's not exactly the syntax but it will be a require statement and we'll do the same thing for

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the user.

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So why would we do this.

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There's two answers.

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First one is that it will help us clean up our code and shorten this.

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So we'll get rid of all of this and move it to separate files.

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But also it helps us make our code more modular.

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And if I wanted to have another application that use the same user model or another file that used it

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I wouldn't have to duplicate the code.

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I could just require that code in that file as well.

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So two main goals we will be using when I'm about to show you to also modularize are actually yes instead

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of the Yelp camp application this is getting pretty long.

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You have a bunch of routes.

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We have all the model code up here and this will continue to grow as we get more and more models.

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So after this video I'm going to show you how we can clean this up.

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But to start we're going to work with this references dodgiest file.

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And the first thing I'm going to do is move all of this code that relates to creating the model.

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The post model and I'll move it to a new file and I'm going to make a new directory first called models

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and the file will be models.

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Slash post.

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Jay Yes.

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And then while I'm here I'll also do models slash user dodginess just like that.

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OK.

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And then I'll open both of those up.

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Let's start with post models slash post.

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Yes.

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OK.

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And we can paste that code in.

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And the first thing you notice is that we now have an error.

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It's telling us that Mongoose is not defined.

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So we can start by defining mongoose and this is something that you just have to do if you're modularize

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in your code if you're splitting it up into small pieces.

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You're going to have to require things a lot more often.

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So we require mongoose and there's one major change you need to make which is that we need to use modules

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led experts down here which I like to think of as a return value for a file.

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So just like with the return value in a function nothing is returned unless we explicitly tell javascript

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what we want to return out of the function.

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Same thing with the file if we just include the file but we don't export anything out of it.

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We'll actually be including Nothing will be requiring just an empty file.

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What we need to do is export something and what we want to export is the model.

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So we're going to copy that and say modular but exports equals mongoose up model post.

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So we're declaring the schema and then we're declaring the model.

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And that's what we're sending out.

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We could also have done this and then said module about exports equals posts.

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Either one would work.

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But I'm going to do it just in one swoop here.

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So we'll get rid of this and add this back down here.

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OK so now let's see how we've required this file inside references.

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Yes I'm going to comment out pretty much everything else for now.

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Well keep the user schema there but I'm going to get rid of all this just so that we're not running

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anything.

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All I want to do is make sure that we can import this code.

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So it's going to be var post require.

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And the file is post-up.

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Yes we can just refer to it as post but it's inside the model directory.

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So models slash post and save and try running this file and see what happens.

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So node references dot J us and we get a small error and it tells us cannot find module models.

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Slash post.

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And that's because we're missing one key thing when we're referencing file paths and directories in

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node to reference the current directory We need a dot slash and that will reference where we currently

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are which is associations.

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And then we want to access the models directory and then the post file and site of that.

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Now let's clear the terminal.

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Try that again.

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This time it looks like it worked.

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We don't see anything which is a good sign.

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We shouldn't see anything with that code that we have here.

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OK.

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So let's close out of this and now will do the exact same thing for the user code.

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So we're going to take all of this cut it out and then open up the user J S file.

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So that's going to be C9 models slash user data.

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Yes.

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And not put this code in here.

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Once again we need to import mongoose.

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So our mongoose equals require mongoose and save that and then we're going to do a module that exports

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equals the mongoose top model that we're creating from user.

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So this will send out the model that when we require this file this is the one thing that we're returning

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out that we're exporting out to use.

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And this doesn't always have to be a single thing like this.

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We can return multiple pieces.

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We can make an object here and add a bunch of different bits of data.

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But this is an object remember mongoose top model generates an object for us.

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So that's what we're turning will save.

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Now go back to references and we're going to run var user he calls require and this should be dot slash

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models slash user and let's save and make sure both of those are requiring correctly.

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There we go.

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And now let's try using it.

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So what we're going to do is just uncomment some of this code will do this right here which is going

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to make us another post with how to cook the best burger and we'll do part four.

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And some jibberish.

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Let's change that up a little bit and then it's going to find that user with email Babuji com and everything

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else should be the same it's going to push in that post and canceled out logs and data.

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So if everything worked out just fine.

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This should work and we should see a user with some posts printed out.

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So let's give it a shot.

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There we go.

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We have our user Bob Belcher Bob at gmail dot com and then we have a bunch of post IDs inside the post

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Saray great.

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So let's recap everything Monserrat exports allows us to break things into files.

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And the reason we'd want to do that is to clean up our code first and foremost.

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This makes it a lot cleaner appear but it also makes things modular and makes it reusable so I can have

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another file where I require the post or the user model and I don't have to duplicate any code.

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Aside from the single line in the next video I'm going to show you how we can clean up camp using the

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exact same concepts.