Added has_column and column_info methods

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Relationship / HasMany.pm

diff --git a/lib/DBIx/Class/Relationship/HasMany.pm b/lib/DBIx/Class/Relationship/HasMany.pm
index 2efebb7..f30ff50 100644 (file)
--- a/lib/DBIx/Class/Relationship/HasMany.pm
+++ b/lib/DBIx/Class/Relationship/HasMany.pm
@@ -8,21 +8,23 @@ sub has_many {
     
   eval "require $f_class";
 
-  if (!ref $cond) {
+  unless (ref $cond) {
+    my ($pri, $too_many) = $class->primary_columns;
+    $class->throw( "has_many can only infer join for a single primary key; ${class} has more" )
+      if $too_many;
     my $f_key;
+    my $f_class_loaded = eval { $f_class->columns };
+    my $guess;
     if (defined $cond && length $cond) {
       $f_key = $cond;
-      $class->throw( "No such column ${f_key} on foreign class ${f_class}" )
-        unless ($@ || $f_class->_columns->{$f_key});
+      $guess = "caller specified foreign key '$f_key'";
     } else {
       $class =~ /([^\:]+)$/;
-      $f_key = lc $1 if $f_class->_columns->{lc $1};
-      $class->throw( "Unable to resolve foreign key for has_many from ${class} to ${f_class}" )
-        unless $f_key;
+      $f_key = lc $1; # go ahead and guess; best we can do
+      $guess = "using our class name '$class' as foreign key";
     }
-    my ($pri, $too_many) = keys %{ $class->_primaries };
-    $class->throw( "has_many can only infer join for a single primary key; ${class} has more" )
-      if $too_many;
+    $class->throw("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}" },
   }