arangosh> db._create("users", { keyOptions: { allowUserKeys: false } });
[ArangoCollection 17645, "users" (type document, status loaded)]
arangosh> db.users.save({ name: "user 1" });
{
"_id" : "users/17649",
"_key" : "17649",
"_rev" : "_XGh_PDi--_"
}
arangosh> db.users.save({ name: "user 2", _key: "myuser" });
[ArangoError 1222: unexpected document key]
arangosh> db.users.save({ name: "user 3" });
{
"_id" : "users/17654",
"_key" : "17654",
"_rev" : "_XGh_PDu--_"
}