yah someone else asked about this recently, clearly the docs are missing
this little point:
you can say:
m = mapper(User, users, properties = {
'_user_name' = users.c.user_name
})
to override the property name it uses against the column.
we also have a guy working on something new, an enhanced "property" object
on the class, where you might be able to do something like this:
User.user_name.beforegetitem = lambda self: <etc>
User.user_name.beforeappend = etc
so maybe we we will get something like that going soon as well.
Wade Leftwich wrote:
> Is there a way to specify what happens when a column property is set?
>
> Take an ordinary class like this contrived example:
>
> class User(object):
>
> def __init__(self, user_name=None, email=None):
> self.email = email
> self._setuser(user_name)
>
> def _setuser(self, name):
> self._user_name = name
> if name == 'fred':
> self.email = '[EMAIL PROTECTED]'
>
> def _getuser(self):
> return self._user_name
>
> user_name = property(_getuser, _setuser)
>
>
> Now I want to map this User class (or a different class that acts the
> same) to a table whose columns are 'user_name' and 'email'. When
> user_name is set, I want the same logic to apply.
>
> Is this doable? Any help appreciated.
>
> I'm just getting started with SqlAlchemy, really diggin it so far.
>
> -- Wade Leftwich
> Ithaca, NY
>
>
>
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