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In this video, let's implement a route to update a post.

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The step we are going to do to update a post, we're going to be a little bit difficult than the one

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that we have done so far.

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But I'm going to move step by step and explain everything I write.

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So let's go so back to the route and this is a route that we are going to implement the update.

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So let me go ahead and test inside Postman Update and I made a request and I see I update post route

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meaning it's working.

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So let's go ahead and implement the logic.

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So what we are going to do is that again, if we are dealing database, the updating is going to be

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pretty easy.

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But writing onto a file, the implementation going to be difficult than doing with a normal database.

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But I'm going to help you to reinforce your knowledge when it comes to JavaScript.

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So now let's remove this one from here.

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The first step is we need the ID and indeed these are ID.

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I know now we know how to get the ID.

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The next step is you want to get the properties that we want to update and we can get that one from

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registered so counts here and we can structure that from red dot body.

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All right.

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And we want the new URL.

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We want the title here and we want the description about the posts as that.

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So if you are not familiar with JavaScript about this syntax, we treated this one in details and the

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JavaScript section.

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But let me explain what is going on here.

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If you console.log read Dot Body, I'm going to have all the properties that you pass in onto that.

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So let's go ahead and then console.log the red dot body.

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So let me get back to the postman and now for the updates.

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I'm going to provide the values you want to update, so click on body and then click on batting and

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then Non and click on raw and then JSON data.

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So we're going to pass in the JSON data, meaning the properties that we want to update.

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So first is we want a title and then title here, let me say updated title.

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All right.

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Just to show that it has been updated.

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And then the description and let me say this, I'm going to be description.

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And then the you are all going to be the you are is going to be.

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ATP Cologne image dot com.

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Anything.

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All right, so this is what I want.

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When I hit send, let me check the terminal, and you can see that I have the object.

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If I want a title, I'm going to be Red Dead Body.

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The title Red Dead Body the description and record body the URL.

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Now I get the properties that I want updates.

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The next step is let's find the post that you want to update.

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So here we go find.

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The Post to update.

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And here we are going to use a JavaScript method called Fine.

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So here we go.

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Const found post is equal to the post data dot fine.

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And the time you pass in a callback function and then this callback function you have access to the

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post and now here we go.

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So you're are going to return the post ID post ID if it is equal to the ID in the params.

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Post found all the found posts and let's see.

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So now back to post, man.

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Let's make the requests and let's hit send back to my terminal.

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I see undefined meaning that the ID, which is 23, is not part of the post record or data here.

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The ID here I have one and two.

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So let me provide that.

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Here is going to be let me see two.

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Here it's saying check the terminal and I have the post here.

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So let's also check if the post is not found.

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Because if I make use of any ID here and I st I get undefined.

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But let's give a beautiful message to the user.

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So now back to the root here.

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Let's also check if there is no post.

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So down here going to be if there is no found post, then we can go ahead and then return from this.

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So return and then rest dot json and then you will see that message is equal to post not.

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Found.

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Let's save it and let's check again.

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Let me hit send and I see a message that post not found.

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If I make use of one or two when I hit st, let's check the console.

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I don't see anything here is because I'm not console.

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Again the post.

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So how can we update it?

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Let's look at the flow here.

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The steps.

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Step number one is I'm going to filter out all the posts, which is not equal to this.

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So I'm going to get a new array of posts.

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And next is I'm going to update the found post and then push it back into the newly filtered array of

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posts.

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And with that, I need to run to the file.

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So this added steps.

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So down here we can go ahead and filter those posts.

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So here we go.

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So let me comment here and say filter.

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So here we go.

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Concert theater.

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Post is equal to the post data dot filter.

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As we did before.

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If they were to then pass in a callback function.

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And for this one I'm going to use a function to make it pretty easy so I have access to the posts and

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then I role function and then the post.

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Dart.

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I'd.

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Which is equal to the ID of the post that I want to find.

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Next is if I try to console log filtered post here, you are going to see that.

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The post being found will not be part of the filtered one.

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Now back to post mine.

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When I hit st in the back to my terminal I see that I don't see the post with.

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I do too.

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So here we go.

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After that, I'm going to take the front post to update it.

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So here we go.

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So update the found post.

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So here we go.

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The found post dot title is now equal to the title from the request body.

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Then likewise the description is going to be from description from here.

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The one that we have structured up here.

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And then after that, I also want to update the URL, which is post dot URL, which is equal to you

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are from the body.

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And now here we go.

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The next step is I need to push this newly updated post into this.

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So here we go.

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We're going to be push the updated post into the filtered.

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Posts are re.

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So here you go.

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Now let's take the future post docs.

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Let me use Onshape throughout to be at the beginning of the array and I'll pass in the found posts.

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Now if I try to console.log the future post, I'll be able to see the newly updated repos in the array.

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So let's go ahead and do that before we continue.

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Now we will take post here.

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All right.

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So back to post man.

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And next is let me check the payload.

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Click here or expand it.

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And now I see updated title and the updated description.

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Let me hit send and check the terminal and if will see that I have it been added into the array.

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I have the title here updated in the description, but if I check the file, I don't see that because

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I'm not writing onto the file.

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So here we go.

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So let me remove the console.

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Look here and next page.

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Right to the file.

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Right to the file.

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So the same logic here, we can create a function to get this one line that we are just repeating ourself.

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We need the same function here, the same thing we did for the creating and deleting so we can create

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a function to get this one done.

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But it's working or better.

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So we have the function here.

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Here.

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Why are we using it?

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This function, we have it here.

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But let's make it pretty simple by copy and paste, guys.

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All right, let's play it simple.

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Right?

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So let me copy this function here and now inside the update where the update handler.

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And here is my update and let me pass it here.

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So here is one.

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Ah, the error.

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Okay, so now instead of post here, I'm going to pass in the filtered posts.

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So here we go.

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And next is post updated successfully.

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So now back to postman and let me hit send and I see post updated successfully.

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Let me check the file and I have it been updated.

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Guys, let me create more post double clicking, clicking, clicking, clicking, clicking.

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And let me check.

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And you see that I have a bunch of post here and I can delete any of this one.

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So let me delete post number four and let me hit send post delete deleted.

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I can delete number two and I can delete number one.

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I can delete number six.

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And now let me check what has slipped and now I have to post left.