27 lines
1.2 KiB
Python
27 lines
1.2 KiB
Python
from datetime import datetime
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from sqlalchemy import Table, Column, Integer, String, ForeignKey, DateTime, UniqueConstraint
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from sqlalchemy.orm import relationship
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from orm.base import Base
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Connection = Table('topic_connections',
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Base.metadata,
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Column('child', Integer, ForeignKey('topic.id')),
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Column('parent', Integer, ForeignKey('topic.id')),
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UniqueConstraint('parent', 'child', name='unique_usage')
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)
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class Topic(Base):
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__tablename__ = 'topic'
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slug: str = Column(String, unique = True, nullable = False)
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createdAt: str = Column(DateTime, nullable=False, default = datetime.now, comment="Created at")
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createdBy: str = Column(ForeignKey("user.id"), nullable=False, comment="Author")
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value: str = Column(String, nullable=False, comment="Value")
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# list of Topics where the current node is the "other party" or "child"
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parents = relationship(lambda: Topic, secondary=Connection, primaryjoin=slug==Connection.c.parent, secondaryjoin=slug==Connection.c.child, viewonly=True)
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# list of Topics where the current node is the "parent"
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children = relationship(lambda: Topic, secondary=Connection, primaryjoin=slug==Connection.c.child, secondaryjoin=slug==Connection.c.parent)
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