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KiokuDB::Meta::Attribute::Lazy - Trait for lazy loaded attributes
# in your class: package Foo; use KiokuDB::Class; has bar => ( traits => [qw(KiokuDB::Lazy)], isa => "Bar", is => "ro", ); # Later: my $foo = $dir->lookup($id); # bar is not yet loaded, it will be lazily fetched during this call: $foo->bar;
Instead of using proxy objects with AUTOLOAD, overloading, or similar hacks, you can declaratively specify which attributes you want to make lazy, and this will be done cleanly through the MOP.
This is implemented by using a placeholder object, KiokuDB::Thunk which contains references to the ID and the linker, and KiokuDB::Meta::Instance will know to replace the placeholder with the actual loaded object when it is fetched from the object by an accessor.