Question: how to do batch() across multiple sublevels?

[level]

Question: how to do batch() across multiple sublevels?

[mafintosh]

I use this to do it, https://github.com/mafintosh/sublevel-prefixer and then i just use the toplevel db.

[tgohn]

Thanks for the reply.

From the code, it looks like sublevel-prefixer is not meant to use with nested sublevels.
Because a subleveldown prefix would be in this format sub2.db.prefix === "!sub1!!sub2!"

Just curious, is nested sublevels not a favorable choice?

[mafintosh]

You can calls to sublevel-prefixer
On Tue 4 Aug 2015 at 19:16 John Nguyen [email protected] wrote:

Thanks for the reply.

From the code, it looks like sublevel-prefixer is not meant to use with
nested sublevels.
Because a subleveldown prefix would be in this format sub2.db.prefix ===
"!sub1!!sub2!"

Just curious, is nested sublevels not a favorable choice?

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#4 (comment)
.

[mafintosh]

• You can do subsequent calls to sublevel-prefixer

var prefix = prefixer()
prefix('hello', prefix('world', 'stuff')) // !hello!!world!stuff

[tgohn]

ah, I see, didnt think of using the prefixer like that.
Thanks a lot @mafintosh 😄

[mvayngrib]

@mafintosh how would you preserve the correct encodings on members of the batch (assuming they're different from each other or from the top level)?

[tounano]

@mvayngrib here is what I do.

I always use binary encoding. So whatever I save, I save in binary. For the first week I started doing that it was a headache, but it was bigger headache to work the other way :)

[CMCDragonkai]

So the default separator used in subleveldown is !.

Therefore to acquire the prefix:

var prefix = prefixer('!')

const k = prefix('permissions', 'my-key'); // !my-prefix!my-key

const db = await level();

const permDb = sub(
  db,
  'permissions',
);

db.get(k);

Does that mean k will access the the my-key from permDb?