On Aug 15, 2011, at 12:46 AM, cd34 wrote:
> On Aug 14, 11:39 pm, Michael Bayer <mike...@zzzcomputing.com> wrote:
>>> receive the ExtendedProfile class declarations.
>>
>> Well those are two different classes, so first you'd need to assign a
>> relationship() to AuthUser that references ExtendedProfile. If you're
>> looking for "backref" to do this via ExtendedProfile that's:
>>
>> class ExtendedProfile(...):
>> user = relationship("AuthUser", backref="profile")
>>
>> this assigns a relationship() to ExtendedProfile and AuthUser.
>
> I am able to do that. What I'm trying to do is have a base class that
> is declared in a package that is installed through easy_install (for
> Pyramid), then, allow the user to extend the class locally. So, the
> person installs my package, but, needs to be able to extend
> user_profile themselves.
>
> https://github.com/cd34/pyramid_apex/blob/master/pyramid_apex/views.py
>
> The issue I'm running into currently is that in the model definition
> in pyramid, I don't have access to the config registry to override the
> class creation. So, I'm looking for a way to either do a late binding
> on the relation, or, need to do some really creative coding so that my
> module can access a user supplied profile class.
A relationship() can be added at any time to any mapped class - when using
declarative config, just assigning it to the class is all that's needed,
mapper.add_property() is called as a result. Using "backref" where you had
"back_populates" should also achieve the result of adding a relationship().
Otherwise if "extend" means "subclass", that's an option as well (though it
means you can't change your base class without risking backwards
incompatibility).
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