[Dbix-class] Re: Return value of DBIx::Class::ResultSet::find()

[A. Pagaltzis]

* A. Pagaltzis <pagaltzis at gmx.de> [2007-05-15 02:35]:
> * Matt S Trout <dbix-class at trout.me.uk> [2007-05-14 18:45]:
> > On Mon, May 14, 2007 at 09:15:18AM -0700, John Napiorkowski wrote:
> > > I'm personally attached to the following syntax:
> > > 
> > > my $result = $dbic->resultset('MyApp')->find(xxx) ||
> > > $self->throw('Not Found Type Error');
> > 
> > That'll still work whatever. What would break is
> > 
> > my ($result) = ($dbic->resultset('MyApp')->find(xxx)) || ...;
> > 
> > I suspect.
> 
> No. The left-hand side of a boolean op is always in scalar context.

PS.: what you’re saying there *can* be expressed:

    ( my ( $result ) = $dbic->resultset( 'MyApp' )->find( xxx ) ) || ...;

That makes the assignment as a whole the left-hand side of the
boolean op, so the right-hand side of the assignment is not
affected by the boolean op’s enforced scalar context.

And this would indeed break if `find` returns undef explicitly,
because the return value of a list assignment in scalar context
is the number of rvalue elements, which would be 1 when an undef
is returned.

Regards,
-- 
Aristotle Pagaltzis // <http://plasmasturm.org/>