Fix the bug in who to follow list

pbteja1998 · pbteja1998 · commit 6f2ee61ed7ec · 2021-02-18T17:55:36.000+05:30
diff --git a/src/adapters/fauna/shell.mjs b/src/adapters/fauna/shell.mjs
@@ -9,19 +9,49 @@ const client = new faunadb.Client({
 })
 
 async function main() {
+  const userId = '290862832026649088'
+  const allUsers = q.Filter(q.Documents(q.Collection('users')), (ref) =>
+    q.Not(q.Equals(q.Select(['ref', 'id'], q.Get(ref)), userId))
+  )
+
+  const isFollowing = (followingId) => {
+    const followerId = userId
+    return q.Let(
+      {
+        ref: q.Match(q.Index('unique_user_and_follower'), [
+          q.Ref(q.Collection('users'), followingId),
+          q.Ref(q.Collection('users'), followerId),
+        ]),
+      },
+      q.If(
+        q.Exists(q.Var('ref')),
+        q.Select(['data', 'isFollowing'], q.Get(q.Var('ref'))),
+        false
+      )
+    )
+  }
+
+  const whoToFollow = q.Paginate(
+    q.Filter(allUsers, (ref) =>
+      q.Not(isFollowing(q.Select(['ref', 'id'], q.Get(ref))))
+    )
+  )
+
   const response = await client.query(
-    q.CreateIndex({
-      name: 'followers_by_user',
-      source: q.Collection('user_followers'),
-      unique: false,
-      terms: [
-        {
-          field: ['data', 'user'],
+    q.Map(whoToFollow, (ref) => {
+      const doc = q.Get(ref)
+      return {
+        id: q.Select(['ref', 'id'], doc),
+        name: q.Select(['data', 'name'], doc, null),
+        image: q.Select(['data', 'image'], doc, null),
+        username: q.Select(['data', 'username'], doc, null),
+        account: {
+          firstName: q.Select(['data', 'account', 'firstName'], doc, null),
         },
-      ],
+      }
     })
   )
-  console.log({ response: JSON.stringify({ response }) })
+  console.log({ response: JSON.stringify(response, null, 2) })
 }
 
 main().catch((e) => console.error(e))
diff --git a/src/components/HomePageFeed.tsx b/src/components/HomePageFeed.tsx
@@ -429,7 +429,7 @@ function HomePageAside({ updates }: { updates: HomePageFeedUpdateType[] }) {
                   <ul className="-my-4 divide-y divide-gray-200">
                     {!isLoading &&
                       !isError &&
-                      response.users.slice(0, 3).map((user: User) => (
+                      response.users.map((user: User) => (
                         <li
                           className="flex items-center py-4 space-x-3"
                           key={user.id}
diff --git a/src/pages/api/fauna/who-to-follow.ts b/src/pages/api/fauna/who-to-follow.ts
@@ -12,6 +12,28 @@ const client = new faunadb.Client({
   ...(isProduction ? {} : { port: 8443 }),
 })
 
+const isFollowing = ({
+  followerId,
+  followingId,
+}: {
+  followerId: string
+  followingId: string
+}) => {
+  return q.Let(
+    {
+      ref: q.Match(q.Index('unique_user_and_follower'), [
+        q.Ref(q.Collection('users'), followingId),
+        q.Ref(q.Collection('users'), followerId),
+      ]),
+    },
+    q.If(
+      q.Exists(q.Var('ref')),
+      q.Select(['data', 'isFollowing'], q.Get(q.Var('ref'))),
+      false
+    )
+  )
+}
+
 const FaunaCreateHandler: NextApiHandler = async (
   req: NextApiRequest,
   res: NextApiResponse
@@ -25,8 +47,17 @@ const FaunaCreateHandler: NextApiHandler = async (
   const userId = (session.user as User).id
 
   try {
+    const allUsers = q.Filter(q.Documents(q.Collection('users')), (ref) =>
+      q.Not(q.Equals(q.Select(['ref', 'id'], q.Get(ref)), userId))
+    )
+    const whoToFollow = q.Filter(allUsers, (ref) => {
+      const followerId = userId
+      const followingId = q.Select(['ref', 'id'], q.Get(ref)) as string
+      return q.Not(isFollowing({ followerId, followingId }))
+    })
+
     const response: any = await client.query(
-      q.Map(q.Paginate(q.Documents(q.Collection('users'))), (userRef) => {
+      q.Map(q.Paginate(whoToFollow, { size: 3 }), (userRef) => {
         const userDoc = q.Get(userRef)
         return {
           id: q.Select(['ref', 'id'], userDoc),
