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| 18:55:09
| <Veejay> | ralphtheninja: No worries, it's IRC, I am screened, I don't mind asynchronous |
| 18:55:14
| <Veejay> | Thanks |
| 18:57:38
| <Veejay> | When using leveldb in NodeJS through the various packages and retrieving data from the database using queries is it common practice to implement the filtering as a transform stream? |
| 18:58:03
| <Veejay> | If so, is through2 the canonical package to achieve that, or is there something more leveldb-idiomatic? |
| 18:58:27
| <Veejay> | I've found it to work very well but I might be reinveting the wheel |
| 18:59:07
| <Veejay> | An example would be a bunch of users, and I want to get users where age is higher than some user-defined threshold |
| 19:09:32
| <ralphtheninja> | that should work fine |
| 19:09:38
| <ralphtheninja> | yeah through2 is commonly used |
| 19:10:00
| <ralphtheninja> | also, there's a tonne of modules on npm for various level stuff |
| 19:10:03
| <ralphtheninja> | search for level- |
| 19:12:45
| <ralphtheninja> | Veejay: it's also common to use sub-levels and create keys for indexing |
| 19:16:10
| <ralphtheninja> | so you could have a sub level, which contains elements that are keyed on `age-user_id` and you could do something like sub.createReadStream({ gt: '22-', lt: '33-~' }) which would stream all users from the age of 22 to 33 |
| 19:16:35
| <ralphtheninja> | maybe not ideal keys, but you get the idea |
| 19:19:09
| <ralphtheninja> | but maybe indexing is not even required, say you have 100 users you don't care but if you have 10 million you don't want to stream the whole database through a filter |
| 19:19:24
| <ralphtheninja> | trade offs :) |
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