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40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
from sqlalchemy import Column, DateTime, ForeignKey, Integer, String, func
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from sqlalchemy.orm import backref, relationship
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from database import Base
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class Department(Base):
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__tablename__ = 'department'
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id = Column(Integer, primary_key=True)
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name = Column(String)
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class Role(Base):
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__tablename__ = 'roles'
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role_id = Column(Integer, primary_key=True)
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name = Column(String)
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class Employee(Base):
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__tablename__ = 'employee'
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id = Column(Integer, primary_key=True)
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name = Column(String)
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# Use default=func.now() to set the default hiring time
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# of an Employee to be the current time when an
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# Employee record was created
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hired_on = Column(DateTime, default=func.now())
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department_id = Column(Integer, ForeignKey('department.id'))
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role_id = Column(Integer, ForeignKey('roles.role_id'))
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# Use cascade='delete,all' to propagate the deletion of a Department onto its Employees
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department = relationship(
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Department,
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backref=backref('employees',
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uselist=True,
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cascade='delete,all'))
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role = relationship(
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Role,
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backref=backref('roles',
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uselist=True,
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cascade='delete,all'))
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