fix: nested link with ag pk (#8690)

* fix: extract ag pk

* fix: PR requested changes

* fix: condition for extract rowId

Signed-off-by: mertmit <mertmit99@gmail.com>

---------

Signed-off-by: mertmit <mertmit99@gmail.com>

packages/nocodb/src/db/BaseModelSqlv2.ts

@@ -3563,6 +3563,7 @@ class BaseModelSqlv2 {
 
       // handle if autogenerated primary key is used
       if (ag) {
+        rowId = insertObj[ag.column_name];
         if (!response) await this.execAndParse(query);
         response = await this.readRecord({
           idOrRecord: insertObj[ag.column_name],
@@ -3660,14 +3661,14 @@ class BaseModelSqlv2 {
     force?: boolean;
   }) {
     // handle if composite primary key is used along with ai or ag
-    if ((ai || ag) && (force || this.model.primaryKeys?.length > 1)) {
+    if (ag) {
+      return insertObj[ag.column_name] ?? rowId;
+    } else if (ai && (force || this.model.primaryKeys?.length > 1)) {
       // generate object with ai column and rest of the primary keys
       const pkObj = {};
       for (const pk of this.model.primaryKeys) {
         const key = pk.title;
-        if (ai && pk.id === ai.id) {
-          pkObj[key] = rowId;
-        } else if (ag && pk.id === ag.id) {
+        if (ai && pk.id === ai.id && !(rowId === null || rowId === undefined)) {
           pkObj[key] = rowId;
         } else {
           pkObj[key] = insertObj[pk.column_name] ?? null;