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$r->{params}{$self->primary_columns} = &some_value;

$h = CGI::Untaint->new(%{$r->{params}});

$obj = $self->create_from_cgi($h);

Can't insert new Library::Book: DBD::mysql::st execute failed: 
Column 'id' cannot be null [for Statement "INSERT INTO book (name, aut
+hor, id) VALUES (?, ?, ?)"]
...
/usr/local/lib/perl5/site_perl/5.8.5/DBIx/ContextualFetch.pm line 51, 
+<GEN2> line 7. 
at 
/usr/local/lib/perl5/site_perl/5.8.5/Class/DBI/FromCGI.pm line 246