chore: remove unused "favorite" track functionality

models/User.js

@@ -24,7 +24,6 @@ const schema = new mongoose.Schema(
     },
     bio: String,
     image: String,
-    favorites: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Track' }],
     following: [{ type: mongoose.Schema.Types.ObjectId, ref: 'User' }],
     areTracksVisibleForAll: Boolean,
     hash: String,
@@ -88,19 +87,6 @@ class User extends mongoose.Model {
     };
   }
 
-  async favorite(id) {
-    if (this.favorites.indexOf(id) === -1) {
-      this.favorites.push(id);
-    }
-
-    return await this.save();
-  }
-
-  async unfavorite(id) {
-    this.favorites.remove(id);
-    return await this.save();
-  }
-
   follow(id) {
     if (this.following.indexOf(id) === -1) {
       this.following.push(id);

routes/api/tracks.js

@@ -63,21 +63,12 @@ router.get(
       query.tagList = { $in: [req.query.tag] };
     }
 
-    const [author, favoriter] = await Promise.all([
+    const author = req.query.author ? await User.findOne({ username: req.query.author }) : null
-      req.query.author ? User.findOne({ username: req.query.author }) : null,
-      req.query.favorited ? User.findOne({ username: req.query.favorited }) : null,
-    ]);
 
     if (author) {
       query.author = author._id;
     }
 
-    if (favoriter) {
-      query._id = { $in: favoriter.favorites };
-    } else if (req.query.favorited) {
-      query._id = { $in: [] };
-    }
-
     const [tracks, tracksCount] = await Promise.all([
       Track.find(query).limit(Number(limit)).skip(Number(offset)).sort({ createdAt: 'desc' }).populate('author').exec(),
       Track.countDocuments(query).exec(),
@@ -363,32 +354,6 @@ router.delete(
   }),
 );
 
-// Favorite an track
-router.post(
-  '/:track/favorite',
-  auth.required,
-  wrapRoute(async (req, res) => {
-    const trackId = req.track._id;
-
-    await req.user.favorite(trackId);
-    const track = await req.track.updateFavoriteCount();
-    return res.json({ track: track.toJSONFor(req.user) });
-  }),
-);
-
-// Unfavorite an track
-router.delete(
-  '/:track/favorite',
-  auth.required,
-  wrapRoute(async (req, res) => {
-    const trackId = req.track._id;
-
-    await req.user.unfavorite(trackId);
-    const track = await req.track.updateFavoriteCount();
-    return res.json({ track: track.toJSONFor(req.user) });
-  }),
-);
-
 // return an track's comments
 router.get(
   '/:track/comments',