Add POST endpoint for books

endpoints/books.post.py

@@ -0,0 +1,21 @@
+# Entity: Book
+
+@router.post("/books", status_code=status.HTTP_201_CREATED)
+async def create_book(book: BookCreate, author_filter: str = None, title_filter: str = None, db: Session = Depends(get_db)):
+    if author_filter:
+        author = db.query(Author).filter(Author.name.ilike(f"%{author_filter}%")).first()
+        if not author:
+            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Author not found")
+        book.author_id = author.id
+
+    if title_filter:
+        existing_book = db.query(Book).filter(Book.title.ilike(f"%{title_filter}%")).first()
+        if existing_book:
+            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Book with similar title already exists")
+
+    new_book = Book(**book.dict())
+    db.add(new_book)
+    db.commit()
+    db.refresh(new_book)
+
+    return new_book