Adding ability to like/unlike a Tweet.

src/routes/home/like.ts

@@ -0,0 +1,52 @@
+import prisma from "$root/lib/prisma";
+import type { RequestHandler } from "@sveltejs/kit";
+
+export const post: RequestHandler = async ({ request }) => {
+  const form = await request.formData()
+  const id = +form.get('id')
+
+  const liked = await prisma.liked.count({
+    where: { tweetId: id }
+  })
+
+  if (liked === 1) {
+    await prisma.liked.delete({ where: { tweetId: id } })
+
+    const count = await prisma.tweet.findUnique({
+      where: { id },
+      select: { likes: true }
+    })
+
+    await prisma.tweet.update({
+      where: { id },
+      data: { likes: count.likes -= 1 }
+    })
+
+    return {
+      status: 303,
+      headers: { location: '/home' }
+    }
+  }
+
+  await prisma.liked.create({
+    data: {
+      tweetId: id,
+      user: { connect: { id: 1 } }
+    }
+  })
+
+  const count = await prisma.tweet.findUnique({
+    where: { id },
+    select: { likes: true }
+  })
+
+  await prisma.tweet.update({
+    where: { id },
+    data: { likes: (count.likes += 1) }
+  })
+
+  return {
+    status: 303,
+    headers: { location: '/home' }
+  }
+}