scalar data are ids

lib/Dancer2/Plugin/JsonApi/Registry/Schema.pm

@@ -85,6 +85,9 @@ sub serialize_data ( $self, $data, $extra_data = {}, $included = undef ) {
 
     return [ map { $self->serialize_data($_,$extra_data, $included) } @$data ] if ref $data eq 'ARRAY';
 
+    # it's a scalar? it's the id
+    return { id => $data, type => $self->type } unless ref $data;
+
     my $s = {
         type => $self->type,
         id   => $self->gen_id($data) };

t/registry-schema.t

@@ -66,6 +66,16 @@ subtest 'attributes' => sub {
 
 };
 
+subtest 'a single scalar == id', sub {
+    my $serialized =
+      Dancer2::Plugin::JsonApi::Registry::Schema->new( type => 'thing' )
+        ->serialize('blah');
+
+    is $serialized->{data} => {
+        type       => 'thing',
+        id         => 'blah',
+    };
+};
 
 
 done_testing();