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##Looks like we found a thief monkey By the way, I liked the trick how you reached till here. You have a good sense of humor. You will improve a lot if you join our course with this passion.
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00:00:02 In this lesson, we'll make use of all of the actions we have created so far.
00:00:06 First, let's read or use the hasVoted action to show whether the user has voted.
00:00:13 Once again, there are so many ways of doing that.
00:00:16 First of all, we can call the hasVoted function directly within the question details page and pass value as props to the votes component.
00:00:25 That would look something like this.
00:00:27 ID question.
00:00:29 Remember, we were on that page for such a long time.
00:00:33 We can just call it right here and then pass it over to the votes component.
00:00:39 But if you've been thinking a bit more on a production level, then you may suggest doing a call on the client side.
00:00:45 We don't want the user to wait for everything to load.
00:00:48 Instead, they can see the question details as soon as possible, right?
00:00:52 So why not just delegate the hasVoted call on the client side?
00:00:56 That seems to be the ideal way, right?
00:00:58 But there is an even better and improved method using the latest React 19 hook called use.
00:01:06 Use is a React API that lets you read the value of a resource, like a promise or context.
00:01:13 You call it like this, const value is equal to use resource.
00:01:18 Unlike other hooks, this one can be called within loops and conditional if statements, and it integrates very well with suspense and error boundaries.
00:01:27 But one question that pops up often when thinking about using the use hook is, should I resolve a promise in a server or a client component?
00:01:37 So we can read through some of the details.
00:01:39 A promise can be passed from a server component to a client component and resolved in the client component with the use API.
00:01:48 You can also resolve the promise in a server component with a wait and pass the required data to the client component as a prop.
00:01:56 That looks something like this.
00:01:58 This is obviously a server component because we're using await, so we can very nicely await it right here and then pass it over into the client component.
00:02:07 But using await in a server component will block its rendering until the await statement is finished.
00:02:14 Instead, passing a promise from a server component to a client component prevents the promise from blocking the rendering of the server component.
00:02:23 Did you get that?
00:02:25 Instead of awaiting it right here and then passing the result to the client component, you can just pass the function itself,
00:02:32 and then the client component can make that call.
00:02:34 And as I mentioned already, the use hook works super well with using error boundaries and suspenses.
00:02:41 And unlike use effect, it prevents request waterfalls.
00:02:44 So, all in all, we get a better performance and user experience.
00:02:48 So in this lesson, I'll teach you how to use the use hook to resolve a promise, which we'll then send as a prop from the question details page to the votes component.
00:02:58 First things first, we have to modify our question details page to use the action and pass the unresolved promises to the votes component.
00:03:06 We can do that right here below the get answers call where we can say const HasVotedPromise.
00:03:13 Okay.
00:03:14 This is very important.
00:03:15 This will not be a value of HasVoted.
00:03:18 It'll contain the entire promise of HasVoted.
00:03:21 And I'll make that equal to HasVoted coming from lib actions, to which we have to pass a target ID of question dot underscore ID,
00:03:32 as well as a target type.
00:03:36 In this case, it'll be question.
00:03:38 Why is this a promise and not the value?
00:03:41 Because we haven't awaited it.
00:03:43 And we won't even do that in here.
00:03:44 Now we can head over to our votes and we can wrap it in suspense coming from React.
00:03:52 That'll look something like this.
00:03:54 And to this suspense, we can pass a fallback, which will simply be equal to a div that'll say loading.
00:04:02 So while it doesn't have the necessary data, it'll simply load.
00:04:06 And then right here at the bottom, we can pass hasVotedPromise equal to hasVotedPromise.
00:04:13 So let's dive into the votes component and let's accept this hasVotedPromise, which will be of a type promise that will result in an action response of hasVotedResponse.
00:04:30 And what is that?
00:04:31 Well, it'll simply either say hasUpVoted is true or hasDownVoted is true.
00:04:36 And here we can use the use hook.
00:04:39 Here's how it works.
00:04:41 we can say const, destructure the success as well as the data, and make it equal to the call of the use hook coming from React,
00:04:51 to which we can pass the entire hasVoted promise.
00:04:55 Of course, don't forget to destructure it right here from the forams.
00:04:59 Now, below this loading, we can destructure the hasUpVoted as well as hasDownVoted properties, from data or an empty object in case data doesn't exist.
00:05:11 I think we spelled them as hasUpvoted with the U letter being uppercased.
00:05:17 And in this case, the letter D being uppercased.
00:05:21 And now we can remove these fake hasUpvoted or hasDownvoted right here from the votes.
00:05:26 We no longer need that.
00:05:28 So just remove it.
00:05:29 Before they were hard-coded to true or false, that's in the question details component.
00:05:35 We just need to pass the upvotes.
00:05:37 the downvotes, we might as well pass the target type, which in this case will be equal to question, as well as the target ID,
00:05:48 which in this case will be equal to question dot underscore ID.
00:05:52 And finally, the has voted promise.
00:05:54 Now we can fix those up a bit in the params.
00:05:57 We'll have the target type, which will be either a question or an answer.
00:06:02 Next, the target ID, which will be of a type string, the number of upvotes, the number of downvotes, and then we don't need those two here because we're
00:06:12 extracting them by using the use hook directly from another server action.
00:06:16 And we can remove them from here.
00:06:17 Now you can see that I use different spellings in other cases, but I want to spell it like this.
00:06:22 HasUpvoted.
00:06:23 So you can select this one where I typed it wrongly and just fix it.
00:06:27 HasUpvoted.
00:06:28 And I think there's another occurrence here.
00:06:29 And now we can fix the HasDownvoted as well to have the proper naming.
00:06:37 Perfect.
00:06:38 Now, before we go ahead and test it, right here, we then handle vote.
00:06:42 The first thing at the top of the try block, we will add a const result, which will be equal to the call of the await create vote server action,
00:06:54 where we want to pass in a target ID.
00:06:58 As well as a target type and finally a vote type.
00:07:02 Of course, the target ID and target type are coming as props to this component.
00:07:07 So we can just get them right there, right here at the function props.
00:07:13 And now we can check if no result.success.
00:07:17 We're not going to throw an error, but rather we're going to return a toast saying failed to vote with a description of something like result.error?message.
00:07:29 Else, we will try to render a success message.
00:07:32 We already have the logic form to say whether the upvote has been added or removed or the downvote has been added or removed.
00:07:39 And then we have a catch.
00:07:41 Right here where we're showing this green icon, we can only show it if we have been successful in adding that upvote.
00:07:47 So we'll say if success is true and has upvoted, then show it.
00:07:53 And we're going to do the same thing for the downvote.
00:07:55 If success is true and has downvoted, now we can try to test it by clicking upvote right here.
00:08:02 And you'll see fail to vote.
00:08:04 Action type path is required.
00:08:07 And action ID is required and author path author is required.
00:08:12 So it's almost like we're not passing the right things into the create vote action.
00:08:17 Let's see if that's really the case.
00:08:18 Let's scroll down to where we're trying to create a vote.
00:08:21 Here where we're finding it, we're finding it based on the action ID and the action type, which we set to the target ID and the target type.
00:08:29 But what happens when we try to create it?
00:08:32 Oh, see, we just refer to those as target type and target ID.
00:08:36 But what we should do instead is, first of all, pass the author, which will be equal to the user ID.
00:08:44 Then we have to pass the action ID.
00:08:47 and make it equal to the target ID.
00:08:49 And finally, we have to pass the action type, which will be equal to the target type.
00:08:53 We also need to pass the vote type as well.
00:08:56 Sure, this could have been handled a bit more graciously by not coming up with two different names for the same thing, action ID and the target ID,
00:09:04 but sometimes this happens and we might need to refactor it later down the line.
00:09:09 But for now, let's see if this fixes the issue.
00:09:11 So if I reload and click UpVote right here, you can see that your vote has been recorded, which is amazing.
00:09:18 Exactly what we wanted.
00:09:20 But unfortunately, the UI didn't really update.
00:09:24 This arrow is not green.
00:09:26 What happens if I reload though?
00:09:28 Oh, there we go.
00:09:29 We have one vote and it is green.
00:09:32 But to fix this, to make sure that the results happen instantly after our user has voted, we have to use the Next.js's RevalidatePath function.
00:09:40 We'll use it right here within CreateVote, somewhere near the end, before the return.
00:09:47 I'll say RevalidatePath.
00:09:51 And specifically, we're going to refer to the routes dot question of a specific target ID.
00:10:01 And of course, we have to import revalidatePath from Next.js.
00:10:05 That is coming right here at the top, coming from Next cache.
00:10:09 What revalidatePath does is simply revalidates all the data on that path.
00:10:14 In this case, calling it after a vote has been created will regenerate or recall all calls to show the new data without a page reload.
00:10:23 For more info on exactly how revalidated path and more works in more detail, you can check out this advanced Next.js lesson.
00:10:31 It's actually a talk I gave for the Git Nation conference.
00:10:34 So you can check it out and hopefully it'll be useful in explaining a bit more deeply under the hood of how everything works.
00:10:41 I'll link it somewhere below this lesson.
00:10:43 But with that in mind, let's now go back over to our question and let me try to downvote it.
00:10:50 As you can see, it happens instantly.
00:10:52 Now, what if I try to downvote it once again?
00:10:54 As you can see, it removes the downvote.
00:10:57 If I do it once again, this is working perfect.
00:11:00 And what with the upvotes?
00:11:03 Okay, that's the same thing, but it looks like it was stuck to one upvote from before.
00:11:08 Interesting.
00:11:09 So if I downvote it and then click upvote, it looks like it doesn't remove the previous vote.
00:11:14 Oh, that's such an interesting bug.
00:11:16 I'm sure I missed something in the code.
00:11:18 So let's debug it in the next lesson.
00:11:20 Maybe you can try to find the issue before I do.
00:11:22 For now, I will commit this right here by saying Integrate Actions on UI, Commit it and sync it.
00:11:30 And let's go ahead and hunt that bug so we can finalize this question part of the votes, but then we can use the votes on the answers as well.