00:00:02 Directly following the question model, we have to implement the answer model.

00:00:07 This one right here.

00:00:08 Below the question, we have many answers.

00:00:11 Each answer has the author or the user that created it, the timestamp, its own numbers of upvotes and downvotes, similar to a question,

00:00:20 because we have to know whether an answer is good or not, the content, and I think that's more or less it.

00:00:26 So let's create it by copying our template model and creating a new file called answer.model.ts.

00:00:35 I'll paste the template and I will use the replace by pressing Ctrl or Command F to replace the model with answer.

00:00:43 There we go.

00:00:44 Now we have the I answer and we can start creating its definition.

00:00:50 So let's first say that each answer will have an author of that specific answer, which will simply be a reference to a user.

00:00:58 After that, we're going to have a question as well, because each answer has to be related to a question.

00:01:04 So we can give it a type of object ID pointing to a question and required is set to true.

00:01:10 So this is a major difference in what I've done in the previous versions of this course.

00:01:15 If I go to the question model right here and put it on the side, you'll notice that no longer do we have a list of answers here.

00:01:25 Before, I actually had an array of different answers which were pointing to references of the answer schema.

00:01:34 But now, you can see that there is no arrays.

00:01:37 This right here simply gives us the number of answers.

00:01:40 And even though this is pointing to a question, it's just a singular object.

00:01:45 It's not an array of answers.

00:01:47 That's because it's a one-to-many relationship.

00:01:50 One question can have multiple answers, but one answer can only be attached to one question.

00:01:56 So this is that performance optimization that I've implemented to make sure that by watching this course, you're getting the best production-level learning.

00:02:04 Each answer will also have its contents.

00:02:07 Then we can have the number of upvotes on an answer, which is going to be a type of number.

00:02:14 And it'll be a default of zero.

00:02:17 We can do the same thing for the downvotes.

00:02:19 And finally, the timestamps will be set to true.

00:02:23 And then we can define the type definition.

00:02:26 We can do that by specifying the author of a type object ID.

00:02:32 Question will be the object ID.

00:02:35 The content will be of a type string.

00:02:37 Upvotes will be a number.

00:02:39 And downvotes will be a number as well.

00:02:42 Now check this out.

00:02:43 Because we're using this IAnswer, or this TypeScript interface in this case, I can immediately notice a mistake that I've made while defining those two properties.

00:02:54 I used the types from the imports right here, which are TypeScript types, and not schema types.

00:03:00 So I am entirely missing the schema.types.objectid reference right here, which are two completely different things.

00:03:08 So thank you TypeScript for saving my ass, and fuck you Copilot for suggesting the wrong code.

00:03:14 See, it's never good to trust AI only.

00:03:17 Great.

00:03:18 With that said, our answer model is done.

00:03:20 Great work.