如何从数据库动态生成pydantic基础模型和模式模型

Question

我正在构建应用程序并使用 FastApi 进行 API 开发，但是，我可以创建（通过手动定义 ORM 基础模型和模式模式）

但我想要一种情况，该模型定义来自我已经在那里定义的数据库。

如何从数据库动态生成pydantic基础模型和模式模型

我真的需要帮助。

// at the moment my post schema is like this
class Post(BaseModel):
    id: int
    title: str
    content: str
    postdate: str


// and my ORM model is like this
class Post(Base):
    __tablename__ = "posts"

    # Defining Colums
    id = Column(Integer, primary_key=True, nullable=False)
    title = Column(String, nullable=False)
    content = Column(String, nullable=False)
    postdate= Column(TIMESTAMP(timezone=True),
                        nullable=False, server_default=text('now()'))



// what i want now is to dynamically generate the model fields from database. because it would be already created there.

example

class Post(BaseModel):
    // this should be populated here from database


// and my ORM model is like this
class Post(Base):
    __tablename__ = "posts"

    # Defining Colums
    // this should be populated here from database

Answer 1

pydantic-db

直接从数据库模式生成 Pydantic 模型。

pydantic-db generate \
    --db-url mysql://user:password@localhost:5432/dbname \
    --output models.py

然后运行

pydantic-db generate --config pydantic-db.yml