link up bid txs and memdb storage + key fixes

lfg it works

x/cosmostest/memdb/biddb.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"cosmos-test/x/cosmostest/types"
 	"encoding/gob"
+	"errors"
 	"log"
 	"math/big"
 
@@ -36,7 +37,7 @@ func (b *bidDB) AddBid(auctionId string, bid *types.Bid) error {
 	err := b.db.Update(func(txn *badger.Txn) error {
 		var bids []*types.Bid
 		bidsOld, err := txn.Get(k)
-		if err == badger.ErrKeyNotFound {
+		if errors.Is(err, badger.ErrKeyNotFound) {
 			// key not found -> just create a new Bid array
 			bids = []*types.Bid{}
 		} else {
@@ -81,7 +82,11 @@ func (b *bidDB) GetHighestBid(auctionId string) (*types.Bid, error) {
 	err := b.db.View(func(txn *badger.Txn) error {
 		bidData, err := txn.Get(k)
 		if err != nil {
-			return err
+			if !errors.Is(err, badger.ErrKeyNotFound) {
+				return err
+			} else {
+				return nil
+			}
 		}
 
 		err = bidData.Value(func(val []byte) error {
@@ -91,6 +96,10 @@ func (b *bidDB) GetHighestBid(auctionId string) (*types.Bid, error) {
 				return err
 			}
 
+			if bids == nil {
+				return nil
+			}
+
 			amt := big.NewInt(0)
 			rAmt := big.NewInt(0)
 			for _, rBid := range bids {