[Dbix-class] CDBI Compatability Issue: Iterators

Christopher H. Laco claco at chrislaco.com
Fri Aug 19 16:46:41 CEST 2005

Last week, with a little prodding and help from Matt, I tried converting 
Handel from CDBI to the CDBICompat layer in DBIC. After some hurdles 
with has_a syntax (assumptions based on the presence or absence of 
inflate), it all worked except for iterators.

In CDBI, you can specify the ->iterator_class to be used, which I have 
set to Handel::Iterator; which in turn does a use base 

Matt suggested that have my Iterator subclass DBIx::Class::Resultset. 
That also worked but brought up another problem.

DBIx::Class::Resultset->next calls
DBIx::Class::Row->_row_to_object($self->{cols}, \@row)

DBIx::Class::Row->_row_to_object calls
$class->new(\%vals) on the child object class to be created, which in my 
case has it's own custom ->new() method.

This is different from Class::DBI::Iterator; whos next method calls 

So, how do we fix this? can _row_to_object have and extra paramater 
specifying the constructore method?

   sub _row_to_object {
     my ($class, $cols, $row, $constructor) = @_;
     my %vals;
     $vals{$cols->[$_]} = $row->[$_] for 0 .. $#$cols;
     my $new = $class->$constructor(\%vals);
     return $new;

Then the compat layer when loaded gets the Resultsets->next to do the 
right thing?

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