[Dbix-class] RFC: $row->is_same_row($other_row_object)

[Ashley]

I think the DBIC::Row would benefit from an "is_same_row" method.  
This occurred to me while working on a Cat app wherein the primary  
keys might be UUIDs instead of INTs. That means that code like -- $c- 
 >user->id == $whatever->user->id -- is wrong. This particular case  
is easy enough to fix with "eq" but it got me thinking about multi- 
col primary keys and isSameNode in LibXML and that -- $c->user- 
 >is_same_row($whatever) -- seems much cleaner and less likely to  
break than some other practices.

So, I'm just throwing the idea out. Here is a stab, *untested* and  
from someone who doesn't know DBIC's guts, at what it might look like-

=head2 is_same_row

  if ( $obj1->is_same_row($obj2) ) {
      print "Objects 1 and 2 are the same record\n";
  }

And maybe an additional arg to do a "deep" check by refreshing  
objects and comparing all their data(?).

  $obj1->is_same_row($obj2,1) # code for this is *not* included below.

sub is_same_row {
     my $self = shift;
     my $other = shift || return;
     my @pk1 = $self->id;  # Are these returned in reliable order?
     my @pk2 = $other->id;
     return unless @pk1 == @pk2;
     return unless blessed($self) eq blessed($other);
     for ( 0 .. $#pk1  ) {
         return unless "$pk1[$_]" eq "$pk2[$_]";
     }
     return 1;
}

Thanks for looking!
-Ashley