When I am running it it’s saving this whole clause

“$cond”: bson.M{
        “if”:   bson.M{“$eq”: bson.A{“$date”, nil}},
        “then”: time.Now(),
        “else”: “$date”,
    },

in the document. What did I do wrong here can anyone please explain?

update[“$set”].(bson.M)[“date”] = bson.M{
            “$cond”: bson.M{
                “if”:   bson.M{“$eq”: bson.A{“$date”, nil}},
                “then”: time.Now(),
                “else”: “$date”,
            },
        }