Created genre table and added links and endpoints for it.

library_service/models/db/__init__.py

@@ -1,14 +1,17 @@
 from .author import Author
 from .book import Book
+from .genre import Genre
 from .links import (
     AuthorBookLink, GenreBookLink,
     AuthorWithBooks, BookWithAuthors,
-    GenreWithBooks, BookWithAuthorsAndGenres
+    GenreWithBooks, BookWithGenres,
+    BookWithAuthorsAndGenres
 )
 
 __all__ = [
-    'Author', 'Book',
+    'Author', 'Book', 'Genre',
     'AuthorBookLink', 'AuthorWithBooks',
     'BookWithAuthors', 'GenreBookLink',
-    'GenreWithBooks', 'BookWithAuthorsAndGenres'
+    'GenreWithBooks', 'BookWithGenres',
+    'BookWithAuthorsAndGenres'
 ]

library_service/models/db/genre.py

@@ -9,6 +9,6 @@ if TYPE_CHECKING:
 class Genre(GenreBase, table=True):
     id: Optional[int] = Field(default=None, primary_key=True, index=True)
     books: List["Book"] = Relationship(
-        back_populates="authors",
+        back_populates="genres",
         link_model=GenreBookLink
     )

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

library_service/routers/relationships.py

@@ -3,13 +3,13 @@ from sqlmodel import Session, select
 from typing import List, Dict
 
 from library_service.settings import get_session
-from library_service.models.db import Book, Author, AuthorBookLink
-from library_service.models.dto import AuthorRead, BookRead
+from library_service.models.db import Author, Book, Genre, AuthorBookLink, GenreBookLink
+from library_service.models.dto import AuthorRead, BookRead, GenreRead
 
 router = APIRouter(tags=["relations"])
 
 # Add author to book
-@router.post("/relationships", response_model=AuthorBookLink)
+@router.post("/relationships/author-book", response_model=AuthorBookLink)
 def add_author_to_book(author_id: int, book_id: int, session: Session = Depends(get_session)):
     author = session.get(Author, author_id)
     if not author:
@@ -35,7 +35,7 @@ def add_author_to_book(author_id: int, book_id: int, session: Session = Depends(
     return link
 
 # Remove author from book
-@router.delete("/relationships", response_model=Dict[str, str])
+@router.delete("/relationships/author-book", response_model=Dict[str, str])
 def remove_author_from_book(author_id: int, book_id: int, session: Session = Depends(get_session)):
     link = session.exec(
         select(AuthorBookLink)
@@ -51,7 +51,7 @@ def remove_author_from_book(author_id: int, book_id: int, session: Session = Dep
     return {"message": "Relationship removed successfully"}
 
 # Get relationships
-@router.get("/relationships", response_model=List[AuthorBookLink])
+@router.get("/relationships/author-book", response_model=List[AuthorBookLink])
 def get_relationships(session: Session = Depends(get_session)):
     relationships = session.exec(select(AuthorBookLink)).all()
     return relationships

library_service/settings.py

@@ -24,6 +24,10 @@ def get_app() -> FastAPI:
                 "name": "books",
                 "description": "Operations with books.",
             },
+            {
+                "name": "genres",
+                "description": "Operations with genres.",
+            },
             {
                 "name": "relations",
                 "description": "Operations with relations.",