Moved the logic for getting linked data into the relationship router and

added tests for authors.

library_service/routers/authors.py

@@ -1,6 +1,5 @@
 from fastapi import APIRouter, Depends, HTTPException
 from sqlmodel import Session, select
-from typing import List
 
 from library_service.settings import get_session
 from library_service.models.db import Author, AuthorBookLink, Book, AuthorWithBooks
@@ -79,18 +78,3 @@ def delete_author(author_id: int, session: Session = Depends(get_session)):
     session.delete(author)
     session.commit()
     return author_read
-
-# Get all books for an author
-@router.get("/{author_id}/books/", response_model=List[BookRead])
-def get_books_for_author(author_id: int, session: Session = Depends(get_session)):
-    author = session.get(Author, author_id)
-    if not author:
-        raise HTTPException(status_code=404, detail="Author not found")
-
-    books = session.exec(
-        select(Book)
-        .join(AuthorBookLink)
-        .where(AuthorBookLink.author_id == author_id)
-    ).all()
-
-    return [BookRead(**book.model_dump()) for book in books]