add display for WorkType

kontor-api/src/db/models/comic.py

@@ -110,6 +110,17 @@ class WorkType(Base, BaseMixin):
     name = Column(String, nullable=False, unique=True)
     comic_works = relationship("ComicWork")
 
+    def get_artists(self) -> Dict[str, List[str]]:
+        works: Dict[str, List[str]] = {}
+        for work in self.comic_works:
+            comic = work.comic.title
+            artist = work.artist
+            if comic in works:
+                works[comic].append(artist)
+            else:
+                works[comic] = [artist]
+        return works
+
     def __repr__(self):
         return f'Worktype({self.id} {self.version} {self.name} {len(self.comic_works)})'