fix(ts-oss/redis): fall back to "*" for empty or all-null filters (#6014)

mem0-ts/src/oss/tests/redis.filter-expr.test.ts

@@ -0,0 +1,35 @@
+import { buildRedisFilterExpr } from "../src/vector_stores/redis";
+
+describe("buildRedisFilterExpr", () => {
+  it("returns '*' when filters is undefined", () => {
+    expect(buildRedisFilterExpr(undefined)).toBe("*");
+  });
+
+  it("returns '*' for an empty filters object", () => {
+    // Regression: previously produced "" -> invalid RediSearch query
+    // (` =>[KNN ...]`).
+    expect(buildRedisFilterExpr({})).toBe("*");
+  });
+
+  it("returns '*' when every filter value is null/undefined", () => {
+    expect(
+      buildRedisFilterExpr({ user_id: null as any, agent_id: undefined }),
+    ).toBe("*");
+  });
+
+  it("builds a tag clause for a single filter", () => {
+    expect(buildRedisFilterExpr({ user_id: "alice" })).toBe("@user_id:{alice}");
+  });
+
+  it("snake-cases keys and joins multiple clauses", () => {
+    expect(buildRedisFilterExpr({ userId: "alice", runId: "r1" })).toBe(
+      "@user_id:{alice} @run_id:{r1}",
+    );
+  });
+
+  it("drops null/undefined values but keeps the rest", () => {
+    expect(
+      buildRedisFilterExpr({ user_id: "alice", agent_id: null as any }),
+    ).toBe("@user_id:{alice}");
+  });
+});