[Dbix-class] Molesting Schemas

Christopher H. Laco claco at chrislaco.com
Mon Jun 5 19:15:04 CEST 2006

Matt S Trout wrote:
> Christopher H. Laco wrote:
>> Matt S Trout wrote:
>>> Christopher H. Laco wrote:
>>>> As part of the new Handel stuff, I'm trying to provide as much ability
>>>> as possible of using an existing schema instead of just relying on the
>>>> default Handel schema.
>>>> As part of this process, I'm 'injecting' custom component classes into
>>>> the specified schema using load_components. Currently, this operates on
>>>> the classes themselves using $schema_class->class($cart_class).
>>>> The evil in this is that fact that once I inject Handel components into
>>>> the schema classes, they will effect the use of the schema outside of
>>>> Handel. This is somewhat of a Bad Thing.
>>>> So, my question is two fold: First, is it possible to load_component a
>>>> new component into a source instance only, not its class, in a way that
>>>> it will only effect the current source/schema instance, and not all
>>>> usages of the source class?
>>>> $schema_instance->source($cart_source)->load_components(qw/Foo/)
>>>> where
>>>> $schema_instance->class($cart_class) does not have "Foo" loaded?
>>> No, because this happens at the class level.
>>> OTOH you *could* quite happily take the user schema, compose_namespace
>>> it to somewhere else (like e.g. Catalyst::Model::DBIC::Schema does) and
>>> then inject stuff into the classes in the composed version, which will
>>> have no effect whatsoever on the originals.
>> Very true, although that only solves the problem for people who specify
>> a schema_class, and I create the schema_instance. For people who
>> actually pass in their existing schema_instance, my only choice is to
>> work in its original classes.
> Why? Doing a compose_namespace clones the schema so the connection will
> come with it.Works fine as an object method as well as a class method too.

Ooh... I have no idea it worked on an instance and stole the existing
connection. Kewl!

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