81 lines
3.3 KiB
Python
81 lines
3.3 KiB
Python
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"""inventory 仓储域模型：仓库/库存/库存流水。"""
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from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean, Numeric, ForeignKey, UniqueConstraint, CheckConstraint
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from sqlalchemy.sql import func
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from sqlalchemy.orm import relationship
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from shared.models.base import Base
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class Warehouse(Base):
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"""仓库表"""
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__tablename__ = "warehouses"
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id = Column(Integer, primary_key=True, index=True)
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code = Column(String(50), unique=True, index=True)
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name = Column(String(200), nullable=False)
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address = Column(Text, nullable=True)
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manager = Column(String(100), nullable=True)
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phone = Column(String(50), nullable=True)
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is_active = Column(Boolean, default=True)
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is_default = Column(Boolean, default=False)
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created_at = Column(DateTime, default=func.now())
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inventories = relationship("Inventory", back_populates="warehouse")
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def __repr__(self):
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return f"<Warehouse(id={self.id}, name='{self.name}')>"
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class Inventory(Base):
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"""库存表"""
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__tablename__ = "inventory"
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__table_args__ = (
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UniqueConstraint("product_id", "warehouse_id", name="uq_inventory_product_warehouse"),
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CheckConstraint("quantity >= 0 AND locked_quantity >= 0 AND locked_quantity <= quantity", name="ck_inventory_qty_nonnegative"),
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)
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id = Column(Integer, primary_key=True, index=True)
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product_id = Column(Integer, ForeignKey("products.id"), nullable=False, index=True)
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warehouse_id = Column(Integer, ForeignKey("warehouses.id"), nullable=False, index=True)
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quantity = Column(Numeric(12, 4), default=0)
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locked_quantity = Column(Numeric(12, 4), default=0)
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batch_number = Column(String(50), nullable=True)
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location = Column(String(100), nullable=True)
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updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
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product = relationship("Product", back_populates="inventory")
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warehouse = relationship("Warehouse", back_populates="inventories")
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def __repr__(self):
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return f"<Inventory(product_id={self.product_id}, quantity={self.quantity})>"
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@property
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def available_quantity(self):
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return self.quantity - self.locked_quantity
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class StockMovement(Base):
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"""库存变动记录表"""
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__tablename__ = "stock_movements"
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id = Column(Integer, primary_key=True, index=True)
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product_id = Column(Integer, ForeignKey("products.id"), nullable=False, index=True)
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warehouse_id = Column(Integer, ForeignKey("warehouses.id"), nullable=False)
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movement_type = Column(String(20), nullable=False)
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quantity = Column(Numeric(12, 4), nullable=False)
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before_quantity = Column(Numeric(12, 4), default=0)
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after_quantity = Column(Numeric(12, 4), default=0)
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reference_type = Column(String(50), nullable=True)
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reference_id = Column(Integer, nullable=True)
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reference_no = Column(String(50), nullable=True)
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unit_price = Column(Numeric(12, 2), nullable=True)
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total_amount = Column(Numeric(12, 2), nullable=True)
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remark = Column(Text, nullable=True)
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operator_id = Column(Integer, ForeignKey("users.id"), nullable=True)
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created_at = Column(DateTime, default=func.now(), index=True)
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product = relationship("Product", back_populates="stock_movements")
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def __repr__(self):
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return f"<StockMovement(id={self.id}, type='{self.movement_type}', qty={self.quantity})>"
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