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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 module, I'll teach you how to implement collections, or you can call them favorites or saved questions.
00:00:11 Whenever you find a question that you like, or let me rephrase it, when you get a bug and you've been searching for an answer for hours,
00:00:19 sometimes even days and you couldn't find it, but then you finally find that one dev overflow thread where there's an answer that solves your problem.
00:00:28 You definitely want to bookmark that.
00:00:30 So that's exactly what the saved questions or collections or favorites will do.
00:00:34 To implement it, let's create a new action within lib actions, and let's call it collection.action.ts.
00:00:44 Here, we can add an action that adds a question to the collection, which means that we save or bookmark it.
00:00:50 As usual, whenever we create an action, we also have to create a validation schema and its type.
00:00:56 So let's head over into validations.ts.
00:01:00 And right at the bottom, I'll create a new validation for the collection base schema by saying export const collection base schema.
00:01:11 And it'll be equal to z.object where we simply need to get access to the ID of the question we're saving, which is going to be z.string.men1 question ID
00:01:23 is required.
00:01:25 And we'll also create a type, so let's head over into the action.d.ts.
00:01:31 And at the bottom, I'll create a new interface of collection base params.
00:01:38 And we can take in a question ID and make it of a type string.
00:01:43 Finally, within our collection action, we can add a use server directive at the top, since we want this to be executed on the server strictly.
00:01:52 And we can start creating our first server action by saying export async function.
00:01:59 toggle save question and as usual we'll accept the params of a type collection base params and we'll return a promise of an action response specifically
00:02:13 of a type saved boolean.
00:02:16 So here we can define exactly what the action response will contain and it'll contain just a single boolean property whether we have saved it or not.
00:02:25 Next, we can get access to the validation result by calling our special action handler And here we can pass in the params,
00:02:33 which we're passing into the server action, as well as the schema that we want to validate against.
00:02:39 So this will be a collection base schema.
00:02:42 And in this case, we want to set authorized to true because only authorized users can save questions.
00:02:49 After that, as usual, we want to check if validation result is an instance of error.
00:02:56 In that case, we can just return handle error.
00:03:00 and pass in the validation result into it, and define that it'll be in a form of an error response.
00:03:08 And it might seem like I'm going fast through this, but I know that we have already done this many, many times for each and every server action we created before,
00:03:15 so it's the same thing.
00:03:17 After we verify that we have passed all the right params that match the following schema, we can then try to extract some of the values out of it.
00:03:26 So we can say const and destructure the questionId from validationResult.params and we can make an exclamation mark saying that we know that it'll be there.
00:03:38 And since we are dealing with a user, we know that because we have set authorized to be true, we also have access to the user ID coming from validationresult.session?user?id.
00:03:51 Then we can open up a new try and catch block.
00:03:58 In the catch, we can just return handleError as errorResponse.
00:04:05 And in the try, we actually first need to fetch the question that we want to save.
00:04:10 So let me say const question is equal to await question.findById.
00:04:17 And we're going to pass in the question ID.
00:04:20 Then if for whatever reason there is no question, we can just throw a new error and say question not found.
00:04:29 Of course, for this question, we actually have to import it from the database to have access to its model.
00:04:35 Next, we can try to form a collection by saying const collection.
00:04:41 is equal to await collection coming from add forward slash database dot find one.
00:04:49 So we want to see if a collection for that question already exists.
00:04:53 So we need to pass in the question of a question ID, and we need to know not only whether some user has added that specific question to their collection,
00:05:02 but also whether our current user has added it.
00:05:05 So we're going to pass in the author equal to user ID.
00:05:09 If it already has been saved, so if collection is true, then I can just await collection.findById and delete because that means that we want to unsave it.
00:05:23 And we can just return an object where we set success to true as well as the data of saved to false.
00:05:33 But of course, if a collection doesn't exist, In that case, we can await collection.create to which we want to pass over the question set to the question ID,
00:05:45 as well as the author set to the currently logged in user.
00:05:50 And once we save it, don't forget we need to revalidate our path.
00:05:54 So this will be a path of forward slash questions.
00:05:59 So we'll point to the details page of that question.
00:06:04 And we need to import revalidated path from next cache.
00:06:08 And of course, we can have this question details as a part of our dynamic routes right here in the constants.
00:06:15 Let's see if we have question details.
00:06:18 I don't think we do, right?
00:06:19 So right here, I can create a new one, and I think that'll be question underscore details, where we will accept an ID of a question of a type string,
00:06:30 and we will simply return two questions, and then we might as well call it question ID.
00:06:37 So now instead of just manually saying forward slash questions forward slash ID.
00:06:42 Oh, no, sorry, sorry.
00:06:43 It's my bad.
00:06:43 Take a look at this.
00:06:44 We already have it.
00:06:45 It's called a question takes in the ID and points to the question ID.
00:06:49 I just saw it when I started hovering over this.
00:06:52 Typically that then shows you another occurrence of that specific code in your file.
00:06:59 So instead of manually saving it right here, we can just say routes.
00:07:04 coming from constants.question and we need to pass in the question ID.
00:07:10 Finally, once that is done, we can return a success of true and saved of true as well.
00:07:16 And that is it.
00:07:17 This is the code for a server action that toggles on the ability to save or unsave a specific question.
00:07:24 So let me go right here and let me add it.
00:07:28 I'll say add to collection action.
00:07:31 I'll commit it and sync it.
00:07:34 And in the next lesson, we can implement that server action right within the code.
