Upload app/models/cart.py

app/models/cart.py

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+from datetime import datetime, timezone
+from sqlalchemy import Column, Integer, String, Float, DateTime, ForeignKey, Boolean
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+class Coupon(Base):
+    __tablename__ = "coupons"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    code = Column(String(50), unique=True, index=True, nullable=False)
+    discount_percent = Column(Float, nullable=False)
+    is_active = Column(Boolean, default=True, nullable=False)
+    expires_at = Column(DateTime, nullable=True)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), nullable=False)
+
+    carts = relationship("Cart", back_populates="coupon")
+
+class Cart(Base):
+    __tablename__ = "carts"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=True)
+    session_id = Column(String(255), unique=True, index=True, nullable=True)
+    coupon_id = Column(Integer, ForeignKey("coupons.id", ondelete="SET NULL"), nullable=True)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), nullable=False)
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc), nullable=False)
+
+    user = relationship("User", backref="cart")
+    coupon = relationship("Coupon", back_populates="carts")
+    items = relationship("CartItem", back_populates="cart", cascade="all, delete-orphan")
+
+class CartItem(Base):
+    __tablename__ = "cart_items"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    cart_id = Column(Integer, ForeignKey("carts.id", ondelete="CASCADE"), nullable=False)
+    product_id = Column(Integer, ForeignKey("products.id", ondelete="CASCADE"), nullable=False)
+    quantity = Column(Integer, default=1, nullable=False)
+    unit_price = Column(Float, nullable=False)  # snapshot of price when added/updated
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), nullable=False)
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc), nullable=False)
+
+    cart = relationship("Cart", back_populates="items")
+    product = relationship("Product")