On Dec 22, 2011, at 9:37 AM, peter sabaini wrote:
> Hey list,
>
> this sounds like it should be a FAQ, didn't find anything though:
>
> I want to use the ORM in a declarative style and have the table
> definition reflected, eg sth like:
>
> class A(declarative_base()):
> __tablename__ = 'A'
> __table_args__ = {'autoload' : True}
>
> However to do this SA (quite reasonably, really) already needs an
> engine. For various reasons I can only construct one after import time
> however. Is there a way to do a kind of "late reflection", ie. have
> the above class definition but trigger the reflection part later? I
> could of course generate the class object later in a function when the
> engine is already available but maybe there's something more
> elegant...
I was about to type up this recipe on the wiki and then most awesomely I
already did it for someone ! hooray. The current technique for this is at
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/DeclarativeReflectedBase .
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