[Dbix-class] Literals in relationships

[Christopher Heschong]

Literals don't seem to work for relationships for me.  For instance:

my $foo = 'bar';
__PACKAGE__->has_many(
	'things',
	'MyApp::Schema::Thing',
	{
		'foreign.key' => 'self.id',
		'foreign.foo' => \$foo
	}
);

doesn't seem to work.  I'm probably missing something simple, as  
usual.  Any alternate ways of doing this?
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