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Prepare for iterating
:doc:`./box_tuple/totable`
Get a tuple's fields as a table
:doc:`./box_tuple/tomap`
Get a tuple's fields as a table along with key:value pairs
:doc:`./box_tuple/transform`
Remove (and replace) a tuple's fields
:doc:`./box_tuple/unpack`
Get a tuple's fields
:doc:`./box_tuple/update`
Update a tuple
:doc:`./box_tuple/upsert`
Update a tuple ignoring errors
How to convert tuples to/from Lua tables
This function will illustrate how to convert tuples to/from Lua tables and lists of scalars:
tuple = box.tuple.new({scalar1, scalar2, ... scalar_n}) -- scalars to tuple
lua_table = {tuple:unpack()} -- tuple to Lua table
lua_table = tuple:totable() -- tuple to Lua table
scalar1, scalar2, ... scalar_n = tuple:unpack() -- tuple to scalars
tuple = box.tuple.new(lua_table) -- Lua table to tuple
Then it will find the field that contains 'b', remove that field from the tuple, and display how many bytes remain in the tuple. The function uses Tarantool ``box.tuple`` functions ``new()``, ``unpack()``, ``find()``, ``transform()``, ``bsize()``.
function example()
local tuple1, tuple2, lua_table_1, scalar1, scalar2, scalar3, field_number
local luatable1 = {}
tuple1 = box.tuple.new({'a', 'b', 'c'})
luatable1 = tuple1:totable()
scalar1, scalar2, scalar3 = tuple1:unpack()
tuple2 = box.tuple.new(luatable1[1],luatable1[2],luatable1[3])
field_number = tuple2:find('b')
tuple2 = tuple2:transform(field_number, 1)
return 'tuple2 = ' , tuple2 , ' # of bytes = ' , tuple2:bsize()
end
... And here is what happens when one invokes the function:
tarantool> example()
---
- tuple2 =
- ['a', 'c']
- ' # of bytes = '
- 5
...

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testing_project / Documentation: reference/reference_lua/box_tuple — English

tuple = box.tuple.new({scalar1, scalar2, ... scalar_n}) -- scalars to tuple
lua_table = {tuple:unpack()} -- tuple to Lua table
lua_table = tuple:totable() -- tuple to Lua table
scalar1, scalar2, ... scalar_n = tuple:unpack() -- tuple to scalars
tuple = box.tuple.new(lua_table) -- Lua table to tuple
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