arangosh> db._create("users", { keyOptions: { allowUserKeys: false } });
[ArangoCollection 1056561607, "users" (type document, status loaded)]
arangosh> db.users.save({ name: "user 1" });
{
"_id" : "users/1056889287",
"_rev" : "1056889287",
"_key" : "1056889287"
}
arangosh> db.users.save({ name: "user 2", _key: "myuser" });
[ArangoError 1222: collection does not allow using user-defined keys]
arangosh> db.users.save({ name: "user 3" });
{
"_id" : "users/1057216967",
"_rev" : "1057216967",
"_key" : "1057216967"
}