diff --git a/src/utils/relation.ts b/src/utils/relation.ts
new file mode 100644
index 0000000..1007bc0
--- /dev/null
+++ b/src/utils/relation.ts
@@ -0,0 +1,9 @@
+export function connectOrNot(id?: string | null) {
+  return { connect: id ? { id } : undefined };
+}
+export function connectOrDisconnect(id?: string | null) {
+  return {
+    connect: id ? { id } : undefined,
+    disconnect: id === null || undefined,
+  };
+}