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Documentation: reference/reference_lua/box_space/on_replace

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	The ``trigger-function`` can have up to four parameters:
	(tuple) old value which has the contents before the request started,
	(tuple) new value which has the contents after the request ended,
	(string) space name,
	(string) type of request which is ``INSERT``, ``DELETE``, ``UPDATE``, or ``REPLACE``.
	For example, the following code causes ``nil`` and ``INSERT`` to be printed when the insert request is processed and causes ``[1, 'Hi']`` and ``DELETE`` to be printed when the delete request is processed:
	box.schema.space.create('space_1') box.space.space_1:create_index('space_1_index',{}) function on_replace_function (old, new, s, op) print(old) print(op) end box.space.space_1:on_replace(on_replace_function) box.space.space_1:insert{1,'Hi'} box.space.space_1:delete{1}
	Example 3:
	The following series of requests will create a space, create an index, create a function which increments a counter, create a trigger, do two inserts, drop the space, and display the counter value - which is 2, because the function is executed once after each insert.
	tarantool> s = box.schema.space.create('space53') tarantool> s:create_index('primary', {parts = {{field = 1, type = 'unsigned'}}}) tarantool> function replace_trigger() > replace_counter = replace_counter + 1 > end tarantool> s:on_replace(replace_trigger) tarantool> replace_counter = 0 tarantool> t = s:insert{1, 'First replace'} tarantool> t = s:insert{2, 'Second replace'} tarantool> s:drop() tarantool> replace_counter
	As everything executed inside triggers is already in a transaction, you shouldn't use in trigger-functions for ``on_replace`` and ``before_replace``
	transactions,
	yield-operations (:ref:`explicit <app-yields>` or not),
	actions that are not allowed to be used in transactions (see :ref:`rule #2 <box-txn_management>`).
	Example:
	tarantool> box.space.test:on_replace(fiber.yield) tarantool> box.space.test:replace{1, 2, 3} 2020-02-02 21:22:03.073 [73185] main/102/init.lua txn.c:532 E> ER_TRANSACTION_YIELD: Transaction has been aborted by a fiber yield --- - error: Transaction has been aborted by a fiber yield ...

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