fix: fix-negative-number-of-request-crash

Author: tractorss

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gtcr-subgraph",
-  "version": "1.1.8",
+  "version": "1.2.1",
   "description": "Subgraph for Generalized TCR contracts",
   "scripts": {
     "clean": "graph clean",

src/LightGeneralizedTCRMapping.ts

@@ -40,7 +40,7 @@ import {
   Ruling,
   ConnectedTCRSet as ConnectedTCRSetEvent,
 } from '../generated/templates/LightGeneralizedTCR/LightGeneralizedTCR';
-import { ZERO_ADDRESS, extractPath } from './utils';
+import { ZERO, ZERO_ADDRESS, extractPath } from './utils';
 
 // Items on a TCR can be in 1 of 4 states:
 // - (0) Absent: The item is not registered on the TCR and there are no pending requests.
@@ -658,6 +658,15 @@ export function handleStatusUpdated(event: ItemStatusChange): void {
 
   item.latestRequestResolutionTime = event.block.timestamp;
 
+  if(item.numberOfRequests.equals(ZERO)){
+     log.error(
+       `Encountered 0 as numberOfRequest for Item : {}`,
+       [graphItemID],
+     );
+     item.save();
+     return;
+  }
+
   let requestIndex = item.numberOfRequests.minus(BigInt.fromI32(1));
   let requestInfo = tcr.try_getRequestInfo(event.params._itemID, requestIndex);
   if (requestInfo.reverted) {

subgraph.template.yaml

@@ -1,5 +1,5 @@
 specVersion: 1.0.0
-description: Generalized TCR
+description: Generalized TCR v1.2.1
 features:
   - fullTextSearch
   - ipfsOnEthereumContracts