initerest and random merge posts

dbTools/profile.js

@@ -51,10 +51,10 @@ userDB = (DB) => {
     DB.getPopularProfiles = async (limit = 10) => {
         return DB.profileCols.aggregate([
             {
-                $match: {isGroup: false}
+                $match: {isGroup: {$ne: true}}
             },
             {
-                $addFields: { subscribed_count: {$size: { "$ifNull": [ {"$objectToArray" : "$subscribed"}, [] ] } } }
+                $addFields: { subscribed_count: {$size: { "$ifNull": [ "$following", [] ] } } }
             },
             {   
                 $sort: {"subscribed_count":-1} 
@@ -64,7 +64,7 @@ userDB = (DB) => {
             }
         ]).limit(limit).toArray().catch((err) => {
             console.log(err);
-            return false;
+            return [];
         });
     }
 
@@ -84,7 +84,33 @@ userDB = (DB) => {
             }
         ]).limit(limit).toArray().catch((err) => {
             console.log(err);
-            return false;
+            return [];
+        });
+    }
+
+    DB.getFriendsFriends = async (profileId) => {
+        const profile = await DB.getProfile(profileId);
+        if(!profile) return [];
+        let ids = profile.following.map((id)=>DB.ObjectID(id));
+        let alreadyFollowingMap = {};
+        alreadyFollowingMap[profileId] = 1; //skip that profile
+        profile.following.forEach(id => {
+            if(!alreadyFollowingMap[id]) alreadyFollowingMap[id] = 1;
+        })
+        return DB.profileCols.find({_id:{$in: ids}}).project({following: 1}).toArray().then(profiles => {
+            let friendsOfFriendsMap = {};
+            profiles.forEach(p => {
+                p.following.forEach(followingId => {
+                    if(alreadyFollowingMap[followingId]) return 0;
+                    if(!friendsOfFriendsMap[followingId]) friendsOfFriendsMap[followingId] = 0;
+                    friendsOfFriendsMap[followingId] = friendsOfFriendsMap[followingId] + 1;
+                });
+            });
+            // sort by most related?
+            return Object.keys(friendsOfFriendsMap);
+        }).catch((err) => {
+            console.log(err);
+            return [];
         });
     }