From the Test::MockObject ChangeLog file:

- use UNIVERSAL::isa and UNIVERSAL::can modules
These two module override &UNIVERAL::isa and &UNIVERSAL::can (obviously), and attempt to enforce their "proper" usage (called as a method, not as a function). Of course this is a subject not everyone agrees upon (just look at the CPAN reviews for the two UNIVERSAL:: modules to see this).

From your error messages, I can deduce that Class::DBI does not use &UNIVERSAL::can "properly", so that is the source of your error. Althougth the two errors that it is sandwiched between are (I suspect) bugs in UNIVERSAL::can since it really should handle those edge cases correctly.

UPDATE
Upon closer inspection of the issue, I found this at line 265 of Class::DBI: 

line 255 > my @pk_values = $self->_attrs($self->primary_columns);
line 265 > UNIVERSAL::can($_ => 'id') and $_ = $_->id for @pk_values;

[download]
Then given one of your fixes:
Hardcode the primary key value when you 'create' (i.e. set 'test1' to something)
I would suspect that this is possibly a bug in Class::DBI and maybe line 265 should read: 
UNIVERSAL::can($_ => 'id') and $_ = $_->id for grep { defined $_ } @pk
+_values;

[download]
Or something similar.

However, it could also be argued that it worked before, and the "bug" is only introduced by the addition of UNIVERSAL::can. So I guess it all comes down to which author you want to complain to, chromatic or TBOWDEN :)

-stvn

In reply to Re: Strange bug involving mysql, auto_increment, Class::DBI and Test::MockObject by stvn
in thread Strange bug involving mysql, auto_increment, Class::DBI and Test::MockObject by Mutant

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