On 1/2/08 5:45 PM, Justin Ellison wrote:
> We have SKU's, and each row in the SKU table might or might not have a
> corresponding entry in the INVENTORY table. The gotcha here is that the
> INVENTORY table lives in a different schema than does the SKU table.
> Now, I can get at the inventory "indirectly" by manually creating a new
> Inventory object, but I can't get at it using the relationship in SKU.
> The problem is that RDBO is using the schema name from My::SKU to query
> the associated rows in INVENTORY. I'll be the first to admit that I'm
> pretty green to all this, so it's probably an error in my code, but I've
> tinkered with different things for a few hours now and can't seem to get
> it right.
If you want to do cross-schema relationships, you have to make the schema
differ per-class instead of per-data-source. (The parent object's database
connection will be used to fetch child items; I could add more flexibility
for this in the future, but it can get pretty hairy with transactions and
such...)
So, register a single data source instead of two:
> __PACKAGE__->register_db(
> domain => 'pts',
> type => 'main',
> ...);
but then override the schema in the inventory class:
> package My::Inventory;
>
> use base qw(Rose::DB::Object);
>
> __PACKAGE__->meta->setup(
> table => 'inventory',
> ...
> primary_key_columns => [ qw(sku_code) ],
>
> schema => 'b_custom',
> );
That should do it. Also, you may want to reconsider doing this in every
class:
> our $DB;
>
> sub init_db {
> $DB ||= My::DB->new;
> }
When this code appears in every class, it means that all objects of a given
class will share a single connection. That's an odd arrangement and perhaps
not what you're aiming for :)
If you want to share a Rose::DB object among all your
Rose::DB::Object-derived classes, consider using Rose::DB's new_or_cached()
method.
http://search.cpan.org/dist/Rose-DB/lib/Rose/DB.pm#new_or_cached
To share db objects only under mod_perl, this arrangement works well:
http://search.cpan.org/~jsiracusa/Rose-DB-0.737/lib/Rose/DB/Cache.pm#prepare
_db
Either way, since all your classes are now using a single data source
("pts"/"main") you should only need a single implementation of init_db() in
your common base class (rather than repeated code in each RDBO-derived
class).
-John
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