use setters to manipulate artist and playlist objects

app/models/artist.py

@@ -1,5 +1,5 @@
-import dataclasses
 import json
+import dataclasses
 from dataclasses import dataclass
 
 from app.utils.hashing import create_hash
@@ -33,11 +33,18 @@ class Artist(ArtistMinimal):
     colors: list[str] = dataclasses.field(default_factory=list)
     is_favorite: bool = False
 
-    def __post_init__(self):
-        super(Artist, self).__init__(self.name)
+    def __init__(self, name: str):
+        super(Artist, self).__init__(name)
         self.colors = json.loads(str(self.colors))
 
+    def set_trackcount(self, count: int):
+        self.trackcount = count
+
+    def set_albumcount(self, count: int):
+        self.albumcount = count
+
+    def set_duration(self, duration: int):
+        self.duration = duration
+
     def set_colors(self, colors: list[str]):
         self.colors = colors
-
-# TODO: Use inheritance to create the classes in this file.