from pydantic import BaseModel, Field from typing import Optional from datetime import datetime from uuid import UUID class BookBase(BaseModel): title: str = Field(..., min_length=1, max_length=200, description="Book title") author: str = Field(..., min_length=1, max_length=100, description="Book author") description: Optional[str] = Field(None, max_length=1000, description="Book description") isbn: str = Field(..., min_length=10, max_length=13, description="Book ISBN number") class BookCreate(BookBase): class Config: schema_extra = { "example": { "title": "The Great Gatsby", "author": "F. Scott Fitzgerald", "description": "A novel about the American Dream", "isbn": "9780743273565" } } class Book(BookBase): id: UUID created_at: datetime updated_at: datetime class Config: orm_mode = True schema_extra = { "example": { "id": "123e4567-e89b-12d3-a456-426614174000", "title": "The Great Gatsby", "author": "F. Scott Fitzgerald", "description": "A novel about the American Dream", "isbn": "9780743273565", "created_at": "2023-01-01T00:00:00", "updated_at": "2023-01-01T00:00:00" } }