nft_tokens return empty array if there are no tokens not error (#798)

Co-authored-by: austinabell <[email protected]>
near · Apr 28, 2022 · a7e15f3 · a7e15f3
1 parent cbff5e7
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## [Unreleased]
 
 ### Fixes
+- near-contract-standards: `nft_tokens` in enumeration standard no longer panics when there are no tokens [PR 798](https://github.com/near/near-sdk-rs/pull/798)
 - Optimized `nth` operation for `UnorderedMap` iterator and implemented `IntoIterator` for it. [PR 801](https://github.com/near/near-sdk-rs/pull/801)
   - This optimizes the `skip` operation, which is common with pagination
 

diff --git a/examples/non-fungible-token/res/non_fungible_token.wasm b/examples/non-fungible-token/res/non_fungible_token.wasm
diff --git a/near-contract-standards/src/non_fungible_token/enumeration/enumeration_impl.rs b/near-contract-standards/src/non_fungible_token/enumeration/enumeration_impl.rs
@@ -30,7 +30,7 @@ impl NonFungibleTokenEnumeration for NonFungibleToken {
         // https://nomicon.io/Standards/NonFungibleToken/Enumeration.html#interface
         let start_index: u128 = from_index.map(From::from).unwrap_or_default();
         require!(
-            (self.owner_by_id.len() as u128) > start_index,
+            (self.owner_by_id.len() as u128) >= start_index,
             "Out of bounds, please use a smaller from_index."
         );
         let limit = limit.map(|v| v as usize).unwrap_or(usize::MAX);