Symbols used into generating MongoDB objectId

Question

I have read through MongoDB manual but still couldn't find what I need. Is it only 24 alphabet letters and 0123456789 are involved into autogenerated objectId or "id", Is there a chance that it will generate something like "jkfdfak-123kjsd?" and which exactly symbols are not used.

NO WAY! it will not append

Sede
– Sede

2015-07-27 15:03:29 +00:00
Commented Jul 27, 2015 at 15:03 — Sede
– Sede, Commented Jul 27, 2015 at 15:03

Jordi Martín · Accepted Answer · 2015-07-27 14:40:31Z

1

By default, ObjectId is a 12-byte BSON type, constructed using this data:

4-byte value representing the seconds since the Unix epoch
3-byte machine identifier
2-byte process id
3-byte counter, starting with a random value.

And the string representation is in hexadecimal.

If you want create your own ObjectId you must provide unique hexadecimal (0[xX][0-9a-fA-F]+) string.

answered Jul 27, 2015 at 14:40

Jordi Martín

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3 Comments

Grisha Gevorkyan Over a year ago

by 'must' do you mean its necessary ? because right now I use a completely different format and it's working fine.

Jordi Martín Over a year ago

@GrishaGevorkyan can you provide me an example?

Grisha Gevorkyan Over a year ago

I have 2 objects from User collection with their userId. I create a Follow object in "Follows" collection, where objectId is 'user1Id-user2Id' which enables me to find follow object without queries just by objectId

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