feat: detect self reference

src/controllers/branch-controller.ts

@@ -238,6 +238,13 @@ export class BranchController extends Controller {
     @Body() body: BranchUpdate,
     @Path() branchId: string,
   ) {
+    if (body.headOfficeId === branchId)
+      throw new HttpError(
+        HttpStatus.BAD_REQUEST,
+        "Cannot make this as head office and branch at the same time.",
+        "missing_or_invalid_parameter",
+      );
+
     if (body.subDistrictId || body.districtId || body.provinceId || body.headOfficeId) {
       const [province, district, subDistrict, branch] = await prisma.$transaction([
         prisma.province.findFirst({ where: { id: body.provinceId || undefined } }),