create albums from pre-albums instead of individual tracks

server/app/api/track.py

@@ -15,11 +15,17 @@ def send_track_file(trackid):
     Returns an audio file that matches the passed id to the client.
     """
     try:
-        filepath = [
-            file["filepath"] for file in api.DB_TRACKS
-            if file["_id"]["$oid"] == trackid
-        ][0]
-    except (FileNotFoundError, IndexError) as e:
+        files = []
+        for f in api.DB_TRACKS:
+            try:
+                if f["_id"]["$oid"] == trackid:
+                    files.append(f["filepath"])
+            except KeyError:
+                # Bug: some albums are not found although they exist in `api.ALBUMS`. It has something to do with the bisection method used or sorting. Not sure yet.
+                pass
+
+        filepath = files[0]
+    except IndexError:
         return "File not found", 404
 
     return send_file(filepath, mimetype="audio/mp3")
@@ -31,5 +37,6 @@ def get_sample_track():
     Returns a sample track object.
     """
 
-    return instances.tracks_instance.get_song_by_album("Legends Never Die",
-                                                       "Juice WRLD")
+    return instances.tracks_instance.get_song_by_album(
+        "Legends Never Die", "Juice WRLD"
+    )