fix: fix conditional lookup field

Author: nichenqin

apps/nestjs-backend/src/features/record/query-builder/field-cte-visitor.ts

@@ -1352,9 +1352,14 @@ export class FieldCteVisitor implements IFieldVisitor<ICteResult> {
             if (isDateLikeField(foreignField) || isDateLikeField(hostField)) {
               return { ok: false, residual: null };
             }
+            // When the foreign scope is the same table, compare the host record's fieldId
+            // against the foreign row's referenced field so "Field A is {Field B}" reads as
+            // host.FieldA = foreign.FieldB instead of the reverse.
+            const hostJoinField = foreignTable.id === table.id ? foreignField : hostField;
+            const foreignJoinField = foreignTable.id === table.id ? hostField : foreignField;
             const joinKey = this.buildConditionalEqualityJoinKey(
-              hostField,
-              foreignField,
+              hostJoinField,
+              foreignJoinField,
               mainAlias,
               foreignAlias
             );

apps/nestjs-backend/test/conditional-lookup.e2e-spec.ts

@@ -1146,15 +1146,15 @@ describe('OpenAPI Conditional Lookup field (e2e)', () => {
       await permanentDeleteTable(baseId, table.id);
     });
 
-    it('should return Title2 from foreign rows where Name2 equals host Name', async () => {
+    it('should return Title2 from foreign rows where host Name2 matches foreign Name', async () => {
       const records = await getRecords(table.id, { fieldKeyType: FieldKeyType.Id });
       const row1 = records.records.find((r) => r.id === row1Id)!;
       const row2 = records.records.find((r) => r.id === row2Id)!;
       const row3 = records.records.find((r) => r.id === row3Id)!;
       const row4 = records.records.find((r) => r.id === row4Id)!;
 
       expect(row1.fields[lookupAltTitleField.id]).toEqual(['00001']);
-      expect(row2.fields[lookupAltTitleField.id]).toEqual(['00002']);
+      expect(row2.fields[lookupAltTitleField.id] ?? []).toEqual([]);
       expect(row3.fields[lookupAltTitleField.id] ?? []).toEqual([]);
       expect(row4.fields[lookupAltTitleField.id] ?? []).toEqual([]);
     });