WEBVTT

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Hi everyone!

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In previous video I already showed you how to create transformDTO for response, right?

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for DTO Response and make sure we use the exclude.

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And inside the response we use the @Expose

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Okay all of them

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This will work.

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And now let's go to the next application.

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Let me create next endpoint will be getOne

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I already have a create and getAll.

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Right?

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So in this video I will create a get one method.

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And I will do the get method with the :id, okay

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And with the get one.

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And I will use the decoration.

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Decorator will be the @Param and pass the id

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Make sure the "id" right here, and "id" right here will be the same

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And it will be string because this is the id of the MongoDB, right?

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But if this is the number, make sure we use

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The Parse

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ParseIntPipe

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Okay, I already explained in the first section, right?

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So this is a string.

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And now let me see.

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What is the id here?

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It will concatenation from the post.

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And with the :id from here okay.

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This is endpoint.

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Right? I hope you

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Very clear.

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And let me go to the service and I will create an async getOne

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And create post = await

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Now what is the method?

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Right now we don't.

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We don't know.

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If you don't know how to find the methods inside the post model.

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You can look at the documentation.

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This is Mongo right here.

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It doesn't have anything related to the method in this documentation, because this method is not related

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to the NestJS.

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It actually is the mongoose okay.

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It's a different library, right?

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For that reason, if you go and click on Read the Docs and inside the API right here, you can click

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on the query and you will have many query right here.

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For example like deleteMany, deleteOne, right?

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Or findOne, find, findOne, right?

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And that's how to look at.

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And the findOne() right here is what we look.

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We will pass it some filter okay.

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Now I will show you how to do that.

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findOne() and I can use the _id.

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Right.

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This is the method from.

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This is the property okay.

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This is the default _id from the MongoDB document.

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And I will pass the id from parameter will be string.

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And I will pass directly id right here.

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And I will return the post okay that is and let's see how it works.

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In order to make sure it work I will drop the post and I will recreate again over.

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Okay, I will drop it and I will create a post for example like post one.

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And post 2.

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Okay I will create 2 posts

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And in here inside here, I duplicate one more.

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Endpoint using the get one post and I will specify the id okay.

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The ID is what it is right now.

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I will refresh and I will look into the documentation.

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Go to the posts collection and look at the documentation right here I will copy right here okay.

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Like this.

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And I send a request.

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This is not work.

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Why is not work?

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I will console.log the id I will go here.

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id I will check.

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I will check the ID.

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Here.

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And open.

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So again.

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Oh, sorry for us, I forgot I'll return this.postService

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.get

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getOne pass the id

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Okay, make sure we call the service.

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And I send again, now

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You can see, it's already work, right?

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And it have a id like this

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Very cool

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Right.

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And for example, if I pass the different ID let's see this return something like this.

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That's not what we want?

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Okay.

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I want it has a not found error

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I can easily check inside the service

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I can easily check it.

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!post

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I will throw

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new NotFoundException, actually NotFoundException, okay

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NOT

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NotFoundError

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You can see, NotFoundException inside a nestjs/common

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And I will pass

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Post

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With id not found, for example like that, okay. This Exception right here.

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Is the buil-in exception

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NestJS already write it for you.

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Now if I send it have status and message not found.

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Right.

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Very cool.

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So that's for the video.

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I will see you in the next one.