WEBVTT

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Hi everyone!

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I already talked about the module in previous video, and in this video let me show you how to create

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the modules.

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Okay, now the application right now is very messy.

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I think I will remove the all of the test right here, tesst controller test repository and test service

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okay.

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Remove all the that and inside the module let me remove here okay.

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Remove here.

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Sorry.

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Here here and here.

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Now the application right now, in order to create the some module we usually create a new folder okay.

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For example I will create the blog post application.

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So I will create a post folder okay.

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Now what's inside the post

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I will create a structure like application controller, app module and app service.

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Okay, so I will create the app.

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Sorry.

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The post.controller

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.ts

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post.

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service

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.ts

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And the very important a post.module.ts

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Okay, this is the most important.

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Now let me see how I can create the controller.

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Firstly, I will create a controller in the controller from Nestjs/common and

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The class will be post controller.

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And create a method called get all.

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Okay, we will get all the posts and I will return.

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Well, what's a return for now?

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I will return empty string and I will return inside the service later.

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But let me fix this error is a little bit annoying.

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Now let let me show you how I can find the solution.

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Actually, this is the error, right?

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I think I will copy this and paste it into the stackoverflow.

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I click something topic

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And if I scroll down into here, we can set the end of line will be auto.

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Okay.

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Let me find the eslint right here.

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Inside the rule

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Inside the rule

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Actually, is it prettier, I think.

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Let me find some solution.

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Eslint

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Inside a rule

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I think inside here

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I will copy.

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Let me scroll up into the top one.

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No, that's what we want.

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Here.

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And let me paste it, work

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Or not.

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And actually, it's work, right?

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So we will be in here.

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And this is a rule of estlint.js

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And let's go to the application.

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In the get all, I will create a service.

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Okay I will create a service post service

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Sorry.

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Class.

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Post Service

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And in here I will create a get all also

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Okay.

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The same name is still acceptable.

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And in here I will return.

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I will return something like this.

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And I think I will ignore the repository right now.

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I will create the data.

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I will mock the data.

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Data with object ID:1, title plus one description.

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Will be post 1 description

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Something like this.

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Let me copy & paste 2 times

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And here we will be three and I will return directly right here.

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Okay.

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Later we will fetch by database

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Okay.

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And inside here we will use the dependency injection.

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Right.

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So for that reason firstly we will mark it in the injectable

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Make sure we call that

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And secondly will be inside the post module.

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And actually I don't know I don't remember the code inside the module.

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Okay.

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Never in my life I remember the code.

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So I will copy all of that inside the app module and paste it inside the post module right here.

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And I we will remove everything and rename it into the post module.

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Okay.

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That is.

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And now let.

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Let's pause the video right here and try to make the post work.

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Okay.

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If you have a little bit tricky, I will show you.

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Don't worry, let pause the video.

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Okay.

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How about your solution?

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This work or not?

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Anyway, let me show you.

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Firstly, in the controller I will mark.

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That will be the post controller.

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And inside the provider here we will register for the injectable class.

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We will post service

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And inside here I will use a get decorator.

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For example I use the /posts

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And in here I will create a constructor.

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private post service

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And I will return this.postService

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get all

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Also, we must have a curly brackets.

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Now let me run.

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For example, I will run the post right here.

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Unfortunately, it does not work.

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Why it's not work?

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Because the nestjs right now doesn't have any idea about the post

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Okay.

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It doesn't have any idea about post.

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It's don't know what is the module of the post, because in here you can see it's not correct.

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For example, this is the post module.

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It must somehow connect in with the application module.

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Right.

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But right now this independently.

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It's just a post

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Okay?

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It's just a post.

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And it doesn't have the connection between the application and the post.

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So for that reason, it's not work right now, how we can do that?

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And that's the purpose of the export statement

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Now let me show you.

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I must export the entire model.

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The entire module will be the post module.

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Okay.

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Export that

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And inside inside the app module, inside the import of app module, we will import the post module.

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Now let's see, it's work or not, refresh

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Now you can see it's already returned for me the data.

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Right.

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And that's it, that's how to create a module.

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And we already understand what is import and export. Let's me summarize.

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Firstly

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Firstly

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Let me show you.

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Firstly

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I will create a post module.

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Right?

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But the application right now is.

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Don't have any idea about what is the post module.

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We need some way to create a connection between the post and the application module.

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Right.

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And for that reason, in the post module, we must "export".

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We must export "itself" okay.

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We must export itself.

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And inside the application module we will import.

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Okay.

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We must import the post module.

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And it will create a connection between the post and the application module.

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Okay.

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That's the everything about module.

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I hope you understand this video.

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I will see you in the next one.