Combining two metatables into one for userdata

I tried the following function that I believe should work but it doesn't.

--lua
function CombineObjectMetaTables( object1, object2 )

local meta1 = getmetatable( object1 )
local meta2 = getmetatable( object2 )

local metaCombined = { __index = function( t, k )
if (meta1[ k ]) then return meta1[ k ] end
if (meta2[ k ]) then return meta2[ k ] end
--reaches this point, meaning nothing was found
end }

debug.setmetatable( object1, metaCombined ) --set the new meta table
return object1 --return the object with the new metatable

end


//C++
m_LuaObject = luabind::call_function<luabind::object>( L,
"CombineObjectMetaTables", m_LuaObject, this );
luabind::call_member<void>( m_LuaObject, "Spawn" ); //error: attempt to call
method 'Spawn' (a nil value) (though it is a member function of the
particular class I'm trying)

Does it fail because the lua code is wrong or is it because Luabind has a
special way of managing the __index function and changing it will make the
system break? If it does have such a way, how can I do what I'm trying here
without breaking Luabind?

Thanks

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