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Allow owners to change their subnet symbol #1770

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@l0r1s l0r1s commented Jun 19, 2025

Description

Allow the subnet owner (and root) to change the subnet symbol if it exists and is not already in use.

During subnet creation, the next available symbol is determined by checking if the symbol for the given subnet ID is available. If it is not, the system iterates through the symbol list to find the next available one. If no symbols are available because the list is exhausted, the default symbol is used until the symbol list is extended.

Additionally, the symbol list is refactored to be static.

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Type of Change

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Documentation update
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Breaking Change

If this PR introduces a breaking change, please provide a detailed description of the impact and the migration path for existing applications.

Checklist

  • I have performed a self-review of my own code
  • I have commented my code, particularly in hard-to-understand areas
  • I have run cargo fmt and cargo clippy to ensure my code is formatted and linted correctly
  • I have made corresponding changes to the documentation
  • My changes generate no new warnings
  • I have added tests that prove my fix is effective or that my feature works
  • New and existing unit tests pass locally with my changes
  • Any dependent changes have been merged and published in downstream modules

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@l0r1s l0r1s added the skip-cargo-audit This PR fails cargo audit but needs to be merged anyway label Jun 20, 2025
@l0r1s l0r1s marked this pull request as ready for review June 20, 2025 15:34
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@shamil-gadelshin shamil-gadelshin left a comment

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Looks good. I left a couple of minor questions.

) -> DispatchResult {
Self::ensure_subnet_owner_or_root(origin, netuid)?;

if SYMBOLS
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Seems like a good candidate for the function (you have a couple "symbols related functions" within this PR

return Err(Error::<T>::SymbolDoesNotExist.into());
}

let used_symbols = TokenSymbol::<T>::iter_values().collect::<Vec<_>>();
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This is the second unbounded iteration here. @gregzaitsev Do we care about weights optimizations here?

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