refactor: update basic_association to declarative

Signed-off-by: Mike Fiedler <miketheman@gmail.com>

diff --git a/examples/association/basic_association.py b/examples/association/basic_association.py
index 7a5b46097e3c4006e2b15de48c7c4e63a5bc3efa..2a3f9edcb82d0217b9b9a6f1cce29931725aa0c4 100644 (file)
--- a/examples/association/basic_association.py
+++ b/examples/association/basic_association.py
@@ -10,63 +10,68 @@ of "items", with a particular price paid associated with each "item".
 
 """
 
+from __future__ import annotations
+
 from datetime import datetime
 
 from sqlalchemy import and_
-from sqlalchemy import Column
 from sqlalchemy import create_engine
-from sqlalchemy import DateTime
-from sqlalchemy import Float
 from sqlalchemy import ForeignKey
-from sqlalchemy import Integer
 from sqlalchemy import String
-from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm import Mapped
+from sqlalchemy.orm import mapped_column
 from sqlalchemy.orm import relationship
 from sqlalchemy.orm import Session
 
 
-Base = declarative_base()
+class Base(DeclarativeBase):
+    pass
 
 
 class Order(Base):
     __tablename__ = "order"
 
-    order_id = Column(Integer, primary_key=True)
-    customer_name = Column(String(30), nullable=False)
-    order_date = Column(DateTime, nullable=False, default=datetime.now())
-    order_items = relationship(
-        "OrderItem", cascade="all, delete-orphan", backref="order"
+    order_id: Mapped[int] = mapped_column(primary_key=True)
+    customer_name: Mapped[str] = mapped_column(String(30))
+    order_date: Mapped[datetime] = mapped_column(default=datetime.now())
+    order_items: Mapped[list[OrderItem]] = relationship(
+        cascade="all, delete-orphan", backref="order"
     )
 
-    def __init__(self, customer_name):
+    def __init__(self, customer_name: str) -> None:
         self.customer_name = customer_name
 
 
 class Item(Base):
     __tablename__ = "item"
-    item_id = Column(Integer, primary_key=True)
-    description = Column(String(30), nullable=False)
-    price = Column(Float, nullable=False)
+    item_id: Mapped[int] = mapped_column(primary_key=True)
+    description: Mapped[str] = mapped_column(String(30))
+    price: Mapped[float]
 
-    def __init__(self, description, price):
+    def __init__(self, description: str, price: float) -> None:
         self.description = description
         self.price = price
 
-    def __repr__(self):
-        return "Item(%r, %r)" % (self.description, self.price)
+    def __repr__(self) -> str:
+        return "Item({!r}, {!r})".format(self.description, self.price)
 
 
 class OrderItem(Base):
     __tablename__ = "orderitem"
-    order_id = Column(Integer, ForeignKey("order.order_id"), primary_key=True)
-    item_id = Column(Integer, ForeignKey("item.item_id"), primary_key=True)
-    price = Column(Float, nullable=False)
+    order_id: Mapped[int] = mapped_column(
+        ForeignKey("order.order_id"), primary_key=True
+    )
+    item_id: Mapped[int] = mapped_column(
+        ForeignKey("item.item_id"), primary_key=True
+    )
+    price: Mapped[float]
 
-    def __init__(self, item, price=None):
+    def __init__(self, item: Item, price: float | None = None) -> None:
         self.item = item
         self.price = price or item.price
 
-    item = relationship(Item, lazy="joined")
+    item: Mapped[Item] = relationship(lazy="joined")
 
 
 if __name__ == "__main__":