fix handling preferred gauge APRs

Author: gmbronco

.changeset/purple-files-call.md

@@ -0,0 +1,5 @@
+---
+'backend': patch
+---
+
+fix handling preferred gauge APRs

modules/aprs/examples/integration.ts

@@ -2,8 +2,8 @@ import { AprService } from '../';
 import { Chain } from '@prisma/client';
 
 async function calculationExample(
-    chain: Chain = 'MAINNET',
-    poolId = '0x3de27efa2f1aa663ae5d458857e731c129069f29000200000000000000000588',
+    chain: Chain = 'POLYGON',
+    poolId = '0xe2f706ef1f7240b803aae877c9c762644bb808d80002000000000000000008c2',
 ) {
     const service = new AprService();
 

modules/aprs/handlers/liquidity-gauge-apr/liquidity-gauge-apr-handler.ts

@@ -31,7 +31,8 @@ export class LiquidityGaugeAprHandler implements AprHandler {
         const aprItems: Omit<PrismaPoolAprItem, 'createdAt' | 'updatedAt'>[] = [];
 
         for (const pool of pools) {
-            const gauge = pool.staking.find((s) => s.type === 'GAUGE')?.gauge;
+            const gauges = pool.staking.filter((s) => s.type === 'GAUGE').map((s) => s.gauge);
+            const gauge = gauges.sort((a, b) => (a?.status === 'PREFERRED' ? -1 : 1))[0];
 
             if (!gauge || !gauge.rewards || !pool.dynamicData || pool.dynamicData.totalShares === '0') {
                 continue;