I have a very basic question - ink! now has a Mapping struct for key-value pairs. It seems it does not implement the Iterator trait?
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1You can check this answer: substrate.stackexchange.com/questions/863/…– P.OssunMay 12, 2022 at 12:46
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1Vec is heap-allocated, what if I have a really large collection?– fbielejecMay 12, 2022 at 12:58
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In the real reality, the question is NOT simple.– Tomasz WaszczykMay 29 at 14:17
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2 Answers
There is no way to iterate over a Mapping from a contract. We intent to implement this functionality soon. For more information check out this issue: https://github.com/paritytech/substrate/issues/11410
If you try to iterate over a mapping off chain (from a UI for example) you could use the childState_getKeys RPC to list the keys of the child trie used by the contract in question.
answered May 13, 2022 at 10:11
There are any alternatives for HashMap today Mapping that developers can use and have possibility to iterate?
