disallow undef in versions

[dbsrgits/DBIx-Class-DeploymentHandler.git] / lib / DBIx / Class / DeploymentHandler / VersionHandler / ExplicitVersions.pm

diff --git a/lib/DBIx/Class/DeploymentHandler/VersionHandler/ExplicitVersions.pm b/lib/DBIx/Class/DeploymentHandler/VersionHandler/ExplicitVersions.pm
index 0781c43..625e2f6 100644 (file)
--- a/lib/DBIx/Class/DeploymentHandler/VersionHandler/ExplicitVersions.pm
+++ b/lib/DBIx/Class/DeploymentHandler/VersionHandler/ExplicitVersions.pm
@@ -21,6 +21,7 @@ has database_version => (
 
 has to_version => (
   is         => 'ro',
+  isa        => 'Str',
   lazy_build => 1,
 );