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All right, guys.

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So now we're going to move on to some extra features.

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And I want to start with reviews.

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Now to create a review, we're going to have to have an end point in our back end that we hit, which

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is going to be slash API, slash products, slash whatever the ID of the product and then slash reviews.

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So let's go into back end and we'll start off with the controller.

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So let's go into product controller.

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And let's see, we're going to go down to the bottom here.

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Actually, let's just copy.

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We'll just copy this.

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And let's say this is going to be two.

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Create a new review.

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And it's going to be a post request.

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And like I said, it's going to be API products ID and then slash review.

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Or let's do reviews and it's going to be private.

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So you have to be logged in.

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And let's call this create.

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We'll say create product review.

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And let's see.

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We'll go ahead and get from the body what we need.

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I'm just going to get rid of actually, no, we do need to get the product.

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But above that, let's get.

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The rating and the comment, okay, because they're going to be able to send a number rating and then

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also a comment.

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That's what a review contains.

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And if we look in our model, so in our product model, we have a review schema.

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So rating comment, the name is going to come from the user.

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And then we also have the user ID, So here we're getting the product.

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So we can actually just keep this the way it is.

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Then we're going to check for the product and if there is one, we want to check to see if it's already

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reviewed because we don't want the same person to be able to review the product twice.

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In fact, we can go ahead and just put this in.

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So we have a variable called already reviewed.

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We're going to say product dot reviews and then dot find.

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Okay, So we're not finding through the products, we're finding through the reviews, which is basically

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like a like a sub collection.

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And in here we're saying find passing in a callback function for each review, we're going to say if

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that review user and we're going to turn that user object ID into a string and match it to the logged

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in users ID as a string.

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So if that turns out to be true, that means it's already reviewed.

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And if it's already reviewed, we're going to send a 400 and just say product already reviewed.

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Then we're going to create the review object here.

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So the name again comes from the user, the logged in user's name.

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The rating comes from the body.

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It's going to be sent with the form.

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We're just making sure it's a number and also the comment and then the user is going to be the user

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ID, which comes from the request object.

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Okay?

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Then once we do that, we're going to take our product reviews and we're going to push onto it the new

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review.

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And we want to also set the Num reviews to whatever the length of the reviews because remember, products

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have a num reviews field and then to get the rating, we're going to factor in the new rating by using

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reduce and adding them all together.

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So all the ratings together and then dividing it by the length of reviews.

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So that will give us the overall rating.

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Then we can save it and we'll send a 201, which means something was created and we'll just say review

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added else.

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If there's no review, then we get a 404 just like with everything else.

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Okay.

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So pretty straightforward.

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Let's go ahead and now.

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Export create.

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I created.

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It should be create.

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Create product review.

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Okay.

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And then we need to go to our route.

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So let's go to routes and we want to go to our product routes and let's first off import, create product

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review, and then we're going to add let's go down here and we're going to say router dot route and

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it's going to be slash colon ID slash reviews, post requests, protect middleware and call create product

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review.

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So that's it for the back end.

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So now in the next video, we're going to jump into the front end and start to implement reviews there.