More checks for weird usage of _determine_driver (maint/gen-schema)

diff --git a/lib/DBIx/Class/Storage/DBI.pm b/lib/DBIx/Class/Storage/DBI.pm
index 8955748..f1039d3 100644 (file)
--- a/lib/DBIx/Class/Storage/DBI.pm
+++ b/lib/DBIx/Class/Storage/DBI.pm
@@ -949,15 +949,19 @@ sub _determine_driver {
         else {
           # try to use dsn to not require being connected, the driver may still
           # force a connection in _rebless to determine version
-          ($driver) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i;
+          # (dsn may not be supplied at all if all we do is make a mock-schema)
+          my $dsn = $self->_dbi_connect_info->[0] || '';
+          ($driver) = $dsn =~ /dbi:([^:]+):/i;
         }
       }
 
-      my $storage_class = "DBIx::Class::Storage::DBI::${driver}";
-      if ($self->load_optional_class($storage_class)) {
-        mro::set_mro($storage_class, 'c3');
-        bless $self, $storage_class;
-        $self->_rebless();
+      if ($driver) {
+        my $storage_class = "DBIx::Class::Storage::DBI::${driver}";
+        if ($self->load_optional_class($storage_class)) {
+          mro::set_mro($storage_class, 'c3');
+          bless $self, $storage_class;
+          $self->_rebless();
+        }
       }
     }