Created
March 8, 2012 14:13
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A few SQLAlchemy mixins for common behaviors
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class UTCDateTime(TypeDecorator): | |
impl = DateTime | |
def convert_bind_param(self, value, engine): | |
return value | |
def convert_result_value(self, value, engine): | |
return UTC.localize(value) | |
class StampedMixin(object): | |
created_on = Column(UTCDateTime, default=datetime.utcnow, nullable=False) | |
modified_on = Column(UTCDateTime, default=datetime.utcnow, | |
onupdate=datetime.now, nullable=False) | |
class TrackedMixin(object): | |
@declared_attr | |
def created_by_user_id(cls): | |
return Column(Integer, ForeignKey('users.user_id'), nullable=False) | |
@declared_attr | |
def modified_by_user_id(cls): | |
return Column(Integer, ForeignKey('users.user_id'), nullable=False) | |
@declared_attr | |
def created_by(cls): | |
return relation( | |
'User', | |
primaryjoin='%s.create_user_id == User.user_id' % cls.__name__ | |
) | |
@declared_attr | |
def modified_by(cls): | |
return relation( | |
'User', | |
primaryjoin='%s.modify_user_id == User.user_id' % cls.__name__ | |
) |
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