},
		CustomSerializerString: "world",
	}

	// first time insert record
	out := SerializerStruct{}
	if err := DB.Assign(data).FirstOrCreate(&out).Error; err != nil {
		t.Fatalf("failed to FirstOrCreate Assigned data, got error %v", err)
	}

	var result SerializerStruct
	if err := DB.First(&result, out.ID).Error; err != nil {
		t.Fatalf("failed to query data, got error %v", err)
	}
	AssertEqual(t, result, out)