68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
import uuid
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from decimal import Decimal
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from typing import TYPE_CHECKING, Optional
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from sqlalchemy import Column, ForeignKey, Numeric, UniqueConstraint
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from sqlalchemy.dialects.postgresql import UUID
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from sqlalchemy.ext.hybrid import hybrid_property
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from sqlalchemy.orm import Mapped, relationship
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from .meta import Base
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if TYPE_CHECKING:
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# if the target of the relationship is in another module
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# that cannot normally be imported at runtime
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from .batch import Batch
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from .voucher import Voucher
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class Inventory(Base):
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__tablename__ = "inventories"
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__table_args__ = (UniqueConstraint("voucher_id", "batch_id"),)
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id: uuid.UUID = Column("id", UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
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voucher_id: uuid.UUID = Column(
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"voucher_id",
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UUID(as_uuid=True),
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ForeignKey("vouchers.id"),
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nullable=False,
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index=True,
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)
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batch_id: uuid.UUID = Column("batch_id", UUID(as_uuid=True), ForeignKey("batches.id"), nullable=False)
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quantity: Decimal = Column("quantity", Numeric(precision=15, scale=2), nullable=False)
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rate: Decimal = Column("rate", Numeric(precision=15, scale=2), nullable=False)
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tax: Decimal = Column("tax", Numeric(precision=15, scale=5), nullable=False)
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discount: Decimal = Column("discount", Numeric(precision=15, scale=5), nullable=False)
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voucher: Mapped["Voucher"] = relationship("Voucher", back_populates="inventories")
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batch: Mapped["Batch"] = relationship("Batch", back_populates="inventories")
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def __init__(
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self,
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quantity: Decimal,
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rate: Decimal,
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tax: Decimal,
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discount: Decimal,
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batch: "Batch",
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voucher_id: Optional[uuid.UUID] = None,
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id_: Optional[uuid.UUID] = None,
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) -> None:
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self.batch = batch
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self.quantity = quantity
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self.rate = rate
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self.tax = tax
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self.discount = discount
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if id_ is not None:
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self.id = id_
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if voucher_id is not None:
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self.voucher_id = voucher_id
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@hybrid_property
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def amount(self) -> Decimal:
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return self.quantity * self.rate * (1 + self.tax) * (1 - self.discount)
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@amount.expression # type: ignore[no-redef]
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def amount(cls) -> Decimal:
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return cls.quantity * cls.rate * (1 + cls.tax) * (1 - cls.discount)
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