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Create Vote Model
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In this lesson, we explore the creation of a vote model to efficiently manage voting on questions and answers. This model is designed to avoid large arrays of user IDs by maintaining a separate collection for votes, which references the user and the post being voted on.
00:00:02 Let's create a vote model for storing votes for questions and answers.
00:00:07 You see, it's better to have a separate collection for the vote rather than having a whole array of different users to indicate the number of votes.
00:00:16 What do I mean by that?
00:00:17 Well, if you take a look at the vote object, you'll notice that it has to contain the object ID, which is a reference to the author.
00:00:25 of that vote, meaning which user upvoted it, and then it has to contain a reference of on which answer or question or post,
00:00:34 whatever it is, we're trying to place an upvote or a downvote on, which is denoted by the vote type.
00:00:41 So instead of handling this on the question or the answer level, where you could say that upvotes is an array of the user IDs that upvote that post,
00:00:50 which would result in a huge array of a lot of users with a lot of references, Here on the question, we actually just store the number of upvotes.
00:00:58 And then here we actually keep track of which user liked or disliked what.
00:01:03 So let's create it by creating a new database model of vote.model.ts.
00:01:10 Let's copy over the template and let's change the model to vote.
00:01:18 And then we can start defining its definition.
00:01:21 Each vote has to have an author of the vote, meaning who voted what.
00:01:26 And this will be a schema dot types dot object ID with a reference of user and required to true.
00:01:35 After that, we have to have the ID of the post, which is going to be a reference to either a question or an answer.
00:01:42 So let's say ID is a type schema.types.objectId required to true.
00:01:49 Next, we can have a type.
00:01:50 So this is very important to know, are we voting on a question or on an answer?
00:01:56 So the type will be a string, but we'll actually provide an enum of either the question or the answer.
00:02:07 So this means that the string can be only one of those two things, question or the answer.
00:02:13 And finally, the vote type.
00:02:15 So we can define the vote type, which will be equal to a type string with an enum of upvote or downvote and required will be set to true.
00:02:26 Now we can define this type by saying author will be of a type's object ID.
00:02:32 ID will be of the type's object ID.
00:02:35 Type will be a string, but you can also define it like this, question or answer.
00:02:39 And vote type will be a string of either upvote or downvote.
00:02:44 And that's it.
00:02:45 That's our vote model.
