On Aug 6, 2017 1:33 PM, "Shane Carey" <[email protected]> wrote:
Hey Mike,
I can expand my example. I have an orm mapped attribute like this
class Obj(Base):
_evaluator = Column(String)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self._eval_func = eval(self._evaluator)
@orm.reconstructor
def init_on_load(self):
self._eval_func = eval(self._evaluator)
@property
def evaluator(self):
return self._eval_func
@evaluator.setter
def set_evaluator(ev):
self._evaluator = ev
self._eval_func = eval(self._evaluator)
You can see that I have to explicitly set self._eval_func in three
different places, when really I just want to set it every time
self._evaluator is set.
It looks to me like the orm events are just a different way of placing the
different settings of this class attribute
Also, I would like to not call eval in the getter of the property for the
sake of performance (I know that would simplify the issue).
Is there a way to intercept the setting of self._evaluator for all cases?
Use the init and load event listeners from my previous email on top of one
function. It will be called for init and load.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and
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SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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