space_object extensions

You can extend space_object with custom functions as follows:

1. Create a Lua function.
2. Add the function name to a predefined global variable box.schema.space_mt, which has the table type. Adding to box.schema.space_mt makes the function available for all spaces.
3. Call the function on the space_object: space_object:function-name([parameters]).

Alternatively, you can make a user-defined function available for only one space by calling getmetatable(space_object) and then adding the function name to the meta table.

See also: index_object extensions.

Пример:

-- Доступный для любого спейса, без параметров.
-- После таких запросов значение глобальной переменной global_variable будет 6.
box.schema.space.create('t')
box.space.t:create_index('i')
global_variable = 5
function f(space_arg) global_variable = global_variable + 1 end
box.schema.space_mt.counter = f
box.space.t:counter()