Created genre table and added links and endpoints for it.

library_service/routers/genres.py

@@ -0,0 +1,80 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlmodel import Session, select
+
+from library_service.settings import get_session
+from library_service.models.db import Genre, GenreBookLink, Book, GenreWithBooks
+from library_service.models.dto import (
+    GenreCreate, GenreUpdate, GenreRead,
+    GenreList, BookRead
+)
+
+router = APIRouter(prefix="/genres", tags=["genres"])
+
+# Create a genre
+@router.post("/", response_model=GenreRead)
+def create_genre(genre: GenreCreate, session: Session = Depends(get_session)):
+    db_genre = Genre(**genre.model_dump())
+    session.add(db_genre)
+    session.commit()
+    session.refresh(db_genre)
+    return GenreRead(**db_genre.model_dump())
+
+# Read genres
+@router.get("/", response_model=GenreList)
+def read_genres(session: Session = Depends(get_session)):
+    genres = session.exec(select(Genre)).all()
+    return GenreList(
+        genres=[GenreRead(**genre.model_dump()) for genre in genres],
+        total=len(genres)
+    )
+
+# Read a genre with their books
+@router.get("/{genre_id}", response_model=GenreWithBooks)
+def get_genre(genre_id: int, session: Session = Depends(get_session)):
+    genre = session.get(Genre, genre_id)
+    if not genre:
+        raise HTTPException(status_code=404, detail="Genre not found")
+
+    books = session.exec(
+        select(Book)
+        .join(GenreBookLink)
+        .where(GenreBookLink.genre_id == genre_id)
+    ).all()
+
+    book_reads = [BookRead(**book.model_dump()) for book in books]
+
+    genre_data = genre.model_dump()
+    genre_data['books'] = book_reads
+
+    return GenreWithBooks(**genre_data)
+
+# Update a genre
+@router.put("/{genre_id}", response_model=GenreRead)
+def update_genre(
+    genre_id: int,
+    genre: GenreUpdate,
+    session: Session = Depends(get_session)
+):
+    db_genre = session.get(Genre, genre_id)
+    if not db_genre:
+        raise HTTPException(status_code=404, detail="Genre not found")
+
+    update_data = genre.model_dump(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(db_genre, field, value)
+
+    session.commit()
+    session.refresh(db_genre)
+    return GenreRead(**db_genre.model_dump())
+
+# Delete a genre
+@router.delete("/{genre_id}", response_model=GenreRead)
+def delete_genre(genre_id: int, session: Session = Depends(get_session)):
+    genre = session.get(Genre, genre_id)
+    if not genre:
+        raise HTTPException(status_code=404, detail="Genre not found")
+
+    genre_read = GenreRead(**genre.model_dump())
+    session.delete(genre)
+    session.commit()
+    return genre_read