Re: has_a and the accessor name

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--- Josef Chladek <josef@xxxxxxxx.xxx> wrote:
> 
> Am 28.03.2005 um 08:23 schrieb Peter Speltz:
> 
> >> one question about is_a:
> >> my application is strong hierarchical, i process my classes topdown,
> >> so
> >> i first create the data in main and THEN set the data in the child
> >> class(es). it seems that i can't use is_a for that, because is_a wants
> >> the child to be created first and then creates the parent row(s).
> >>
> >> so with is_a there is no way to create Newsletter::Main first and THEN
> >> the attributes, am i right?
> >> just curious about that, but might_have seems to be a perfect joice...
> >
> > No. is_a creates the base class first then the sub class.  It works
> > great. It
> > sets a before create trigger on your class to create the sub (parent)
> > class.
> 
> hmm, yes that's true. but what i mean is, that my Main is created
> before (because my application does that), and then i can't update via
> is_a...
> 
> so this works:
> my $newsletter = Newsletter::Attributes->create({vorname=>'some',
> nachname =>'name'});
> $newsletter->email('bla@xxxx.xxx');
> $newsletter->update;
> 
> but my application sets
> my $newsletter = Newsletter::Main->create({email=>'bla@xxxx.xxx'});
> 
> the Main table first, then i would neet to update the Attributes table,
> with is_a there is no connnection from Main -> Attributes. as i said
> before might_have handles that perfectly...
> 
>

OK. I may not understand your schema well. Maybe its not a ISA relationship
between Attributes and Main.  If the relationship between NewsLetter Attributes
and Newsletter main is "NewLetter Attributes ISA Newsletter Main" then is_a
would work. But judging by names of classes, it sounds more like the
relationship is "Newsletter::Main HAS Newsletter::Attributes" in which case
might_have is probably exactly what you want. 

cheers,


pjs


		
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