67 lines
1.6 KiB
Python
67 lines
1.6 KiB
Python
"""项目成本明细模型
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管理项目的耗材成本和设备折旧成本
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"""
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from typing import Optional, TYPE_CHECKING
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from decimal import Decimal
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from sqlalchemy import BigInteger, String, DECIMAL, ForeignKey
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from app.models.base import BaseModel
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if TYPE_CHECKING:
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from app.models.project import Project
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class ProjectCostItem(BaseModel):
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"""项目成本明细表（耗材/设备）"""
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__tablename__ = "project_cost_items"
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project_id: Mapped[int] = mapped_column(
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BigInteger,
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ForeignKey("projects.id", ondelete="CASCADE"),
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nullable=False,
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index=True,
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comment="项目ID"
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)
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item_type: Mapped[str] = mapped_column(
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String(20),
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nullable=False,
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index=True,
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comment="类型：material-耗材, equipment-设备"
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)
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item_id: Mapped[int] = mapped_column(
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BigInteger,
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nullable=False,
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comment="耗材/设备ID"
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)
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quantity: Mapped[Decimal] = mapped_column(
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DECIMAL(10, 4),
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nullable=False,
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comment="用量"
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)
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unit_cost: Mapped[Decimal] = mapped_column(
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DECIMAL(12, 4),
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nullable=False,
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comment="单位成本"
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)
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total_cost: Mapped[Decimal] = mapped_column(
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DECIMAL(12, 2),
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nullable=False,
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comment="总成本 = quantity * unit_cost"
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)
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remark: Mapped[Optional[str]] = mapped_column(
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String(200),
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nullable=True,
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comment="备注"
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)
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# 关系
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project: Mapped["Project"] = relationship(
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"Project",
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back_populates="cost_items"
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)
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