Storing data in Rust canisters In developing canisters with Rust, there are 3 different options to store data: ic-stable-memory with stable memory by @senior.joinu ic-stable-structures with stable memory by @ielashi the standard Rust library with heap memory Perks of different options Playing aro…

[image] LiveDuo: What the standard way to update an ic-stable structure variable? Stable structures rely on the Storable trait to load and store data from and into stable memory. The only requirement when updating the schema is for the implementation of Storable to be backward compatible. M…

[image] ielashi: Maybe it’s best to walk through this with an example. Can you share a share a specific example of a data schema and the change you’d like to make? The example below describes a SQL-like relation we have in our codebase. Hope is not too long or complex and I’m sharing it in it…

[image] LiveDuo: Is there a working example ic-stable-memory upgrade mechanism with enums? //github.com/seniorjoinu/ic-stable-memory/tree/develop/examples/schema_evolution

Thanks @senior.joinu for sharing, somehow missed that example. https://www.youtube.com/watch?v=4UfybOlmKgo

Can you share also how you’re implementing Storable? That implementation is really the key to evolving the schema. All you’d need to do is to ensure that your Storable implementation works on both the old schema as well as the new schema. By the way, I don’t know how big you expect your dataset to …

I somehow missed your reply. We took a look at the “event log” and while being an interesting read and an idea that we didn’t have in mind, our Post/Reply system is getting read and updated a lot more frequent than Bitcoin UTXOs so it might not be a good fit. In the meantime, we are getting convin…

As for the Storable trait we had something similar to stable-structures/lib.rs at main · dfinity/stable-structures · GitHub in mind that is bounded at say 100 bytes. In the example linked above, there’s a UserProfile with a u8 age and a String name. It seems that the name field can fill up all 10…

[image] LiveDuo: ic-stable-structures any idea about solving this Error storing in ic stable structure please

Schema migration options with stable memory / heap

Developers

AliSci January 18, 2025, 3:06pm 9

any idea about solving this Error storing in ic stable structure please

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Schema migration options with stable memory / heap

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