fix: handle when HM lookups to BT

packages/nocodb/src/db/BaseModelSqlv2.ts

@@ -5973,7 +5973,11 @@ class BaseModelSqlv2 {
         );
         if (btData) {
           if (typeof btData[col.id] === 'object') {
-            for (const k of Object.keys(btData[col.id])) {
+            for (const k of Object.keys(
+              Array.isArray(btData[col.id])
+                ? btData[col.id][0] || {}
+                : btData[col.id],
+            )) {
               const btAlias = idToAliasMap[k];
               if (!btAlias) {
                 idToAliasPromiseMap[k] = Column.get(this.context, {
@@ -6010,13 +6014,29 @@ class BaseModelSqlv2 {
         if (alias) {
           if (btMap[key]) {
             if (value && typeof value === 'object') {
-              const tempObj = {};
-              Object.entries(value).forEach(([k, v]) => {
-                const btAlias = idToAliasMap[k];
-                if (btAlias) {
-                  tempObj[btAlias] = v;
-                }
-              });
+              let tempObj: Record<string, any> | Record<string, any>[];
+
+              // if array of values then handle by using map, it will be an array when it's HM Lookup to a BT
+              if (Array.isArray(value)) {
+                tempObj = value.map((arrVal) => {
+                  const obj = {};
+                  Object.entries(arrVal).forEach(([k, val]) => {
+                    const btAlias = idToAliasMap[k];
+                    if (btAlias) {
+                      obj[btAlias] = val;
+                    }
+                  });
+                  return obj;
+                });
+              } else {
+                tempObj = {};
+                Object.entries(value).forEach(([k, v]) => {
+                  const btAlias = idToAliasMap[k];
+                  if (btAlias) {
+                    tempObj[btAlias] = v;
+                  }
+                });
+              }
               item[alias] = tempObj;
             } else {
               item[alias] = value;