Iterate through Map Items when using a Tuple Key

Question

When using Ink to store data in a Mapping with a tuple Key, how do you iterate through all the elements in a tuple?

thanks,

yes. as in the erc721 example. operator_approvals: Mapping<(AccountId, AccountId), ()> — donkeydonkey, Sep 6, 2022 at 21:24
so for each account there are many operators accounts. how to iterate through the operators for each main account. — donkeydonkey, Sep 6, 2022 at 21:36

Daan van der Plas · Accepted Answer · 2022-11-08 16:47:34Z

1

Looping through tuples is not ideal (to put it lightly) since they are not heterogeneous.

You could tackle this in two ways:

As you commented yourself: creating another mapping where the associated AccountId's (operator accounts) are mapped to an AccountId.
Mapping with Vec, an example of such a nested structure: https://github.com/paritytech/ink/blob/f03f2a6d63d85caa0cc8a361e5b78948268d2645/examples/mother/lib.rs#L40

answered Nov 8, 2022 at 16:47

Daan van der Plas

2,5982 silver badges24 bronze badges

Add a comment |

Ganesh11 · Accepted Answer · 2022-09-23 12:56:38Z

0

As per this issue, right now it can't possible to iterate over storage.

answered Sep 23, 2022 at 12:56

Ganesh11

1,2081 gold badge4 silver badges17 bronze badges

so would you need to store another mapping of tuples that maps to an array of Ids for each element in the tuple?
– donkeydonkey
Sep 26, 2022 at 2:44

Add a comment |

2 Answers 2