X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FRelationship%2FHasMany.pm;h=6bdefd472eaf27b2521da14b754b84d73774340a;hb=67ba664605de95b5130b55397c7351f53dae4c19;hp=2c9a3bb723178eb60f7afc1ec92a08ec5cc24177;hpb=fd4df97578076cdb1a82385b21995ed28637e096;p=dbsrgits%2FDBIx-Class-Historic.git

diff --git a/lib/DBIx/Class/Relationship/HasMany.pm b/lib/DBIx/Class/Relationship/HasMany.pm
index 2c9a3bb..6bdefd4 100644
--- a/lib/DBIx/Class/Relationship/HasMany.pm
+++ b/lib/DBIx/Class/Relationship/HasMany.pm
@@ -16,6 +16,11 @@ sub has_many {
       "${class} has more"
     ) if $too_many;
 
+    $class->throw_exception(
+      "has_many needs a primary key to infer a join; ".
+      "${class} has none"
+    ) if !defined $pri && (!defined $cond || !length $cond);
+
     my ($f_key,$guess);
     if (defined $cond && length $cond) {
       $f_key = $cond;