32 lines
1.0 KiB
Python
32 lines
1.0 KiB
Python
from typing import TYPE_CHECKING
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from sqlalchemy import Column, DateTime, String, ForeignKey, UniqueConstraint
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from sqlalchemy.sql import func
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from .base import AutoID, Base
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# 只有在静态检查时才导入
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# 运行阶段这段代码会被跳过，彻底避免循环导入
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# 不确定是否用得上，但感觉这是个好习惯，尤其在模型之间有外键关系时
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if TYPE_CHECKING:
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from .user import User
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class Follow(Base, AutoID):
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"""用户关注关系表"""
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__tablename__ = "follows"
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follower_id = Column(
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String(User.id_length()),
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ForeignKey("users.id", ondelete="CASCADE"),
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index=True
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)
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followee_id = Column(
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String(User.id_length()),
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ForeignKey("users.id", ondelete="CASCADE"),
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index=True
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)
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created_at = Column(DateTime(timezone=True), server_default=func.now())
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# 联合唯一索引：防止重复关注
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__table_args__ = (
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UniqueConstraint("follower_id", "followee_id", name="uq_follower_followee"),
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) |