X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FRelationship%2FHasMany.pm;h=b8a9b4c6e99bddffec400e8177ed8226f517323f;hb=fe4118b138326291850bbe2438f61cd0e296034b;hp=eeead265c07be9ac00cb0f698bbb161fa5c9a3f9;hpb=303cf522b1c2841ecab3056cfbb4314fa05151a2;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Relationship/HasMany.pm b/lib/DBIx/Class/Relationship/HasMany.pm
index eeead26..b8a9b4c 100644
--- a/lib/DBIx/Class/Relationship/HasMany.pm
+++ b/lib/DBIx/Class/Relationship/HasMany.pm
@@ -3,17 +3,33 @@ package # hide from PAUSE
 
 use strict;
 use warnings;
+use Try::Tiny;
+use namespace::clean;
+
+our %_pod_inherit_config =
+  (
+   class_map => { 'DBIx::Class::Relationship::HasMany' => 'DBIx::Class::Relationship' }
+  );
 
 sub has_many {
   my ($class, $rel, $f_class, $cond, $attrs) = @_;
 
-  $class->ensure_class_loaded($f_class);
-
   unless (ref $cond) {
-    my ($pri, $too_many) = $class->primary_columns;
-    $class->throw_exception( "has_many can only infer join for a single ".
-			     "primary key; ${class} has more" )
-      if $too_many;
+    $class->ensure_class_loaded($f_class);
+    my ($pri, $too_many) = try { $class->_pri_cols }
+      catch {
+        $class->throw_exception("Can't infer join condition for ${rel} on ${class}: $_");
+      };
+
+    $class->throw_exception(
+      "has_many can only infer join for a single primary key; ".
+      "${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) {
@@ -25,19 +41,21 @@ sub has_many {
       $guess = "using our class name '$class' as foreign key";
     }
 
-    my $f_class_loaded = eval { $f_class->columns };
+    my $f_class_loaded = try { $f_class->columns };
     $class->throw_exception(
       "No such column ${f_key} on foreign class ${f_class} ($guess)"
     ) if $f_class_loaded && !$f_class->has_column($f_key);
-      
+
     $cond = { "foreign.${f_key}" => "self.${pri}" };
   }
 
+  my $default_cascade = ref $cond eq 'CODE' ? 0 : 1;
+
   $class->add_relationship($rel, $f_class, $cond, {
     accessor => 'multi',
     join_type => 'LEFT',
-    cascade_delete => 1,
-    cascade_copy => 1,
+    cascade_delete => $default_cascade,
+    cascade_copy => $default_cascade,
     %{$attrs||{}}
   });
 }