On 1/4/06 4:50 PM, "John Siracusa" <[EMAIL PROTECTED]> wrote:
> On 1/4/06, Sean Davis <[EMAIL PROTECTED]> wrote:
>> I haven't seen a "find_or_create" method anywhere. I know there is a good
>> reason why there isn't one (if there isn't one). It seems like a useful
>> method to have when creating new related objects in multiple tables. Before
>> I naively write my own, why is there not such a method?
>
> It's not really needed in end-user code when using RDBO, IME, and I
> try hard to keep the method namespace of Rose::DB::Object as empty as
> possible. As for creating new related objects, just let the parent
> object methods do it for you.
>
> Here's an abbreviated example from the deep-joins.t test:
>
> $product =
> $Product->new(
> id => 1,
> name => 'Kite',
> vendor =>
> {
> id => 1,
> name => 'V1',
> region => { id => 'DE', name => 'Germany' }
> },
> prices =>
> [
> { price => 1.23, region => { id => 'US', name => 'America' } },
> { price => 4.56, region => { id => 'DE', name => 'Germany' } },
> ]);
>
> $product->save; # the magic happens here
>
> That save() will "find/attach or create" the associated Vendor,
> Region, and Price objects while saving the Product object (all in the
> correct order, all within a transaction where supported). You can go
> as many levels deep as you want. Just look in deep-joins.t, there are
> some hairy examples that go up to 7 levels deep.
WOW!!!
> http://search.cpan.org/src/JSIRACUSA/Rose-DB-Object-0.601/t/deep-joins.t
>
> If you can give me a specific example of where you need to use
> find_or_create() and the normal relationship methods don't cut it,
> then I'll consider adding it (as load_or_create() or maybe
> load_or_save() probably).
Nope. You are correct as usual. I have some messy data and I was trying to
get away without specifying a primary key based on the data itself--wrong
way to go. I have to do some major cleaning....
Sean
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