Cursor support

[cquiroz]

Would it be possible to support openCursor and openKeyCursor operations?
It maybe a bit odd since you can run effects while traversing the cursor like delete

[japgolly]

FYI it'll be a while before I time to implement this. Sorry. PRs welcome though, of course

[japgolly]

Hey FYI I had a try at this over the weekend, looks like it's not going to be as time-consuming as I thought. I'll chip away at this when I have free time and get it in before 2.0.0 final

[japgolly]

Hey @cquiroz, are you doing this off an object store directly, or an index?

[cquiroz]

I haven't done it yet but I was hopin to traverse an object store looking to member of the value.
I think that's done with an index, right?

[japgolly]

It seems indices are optional. You can open cursors on the entire object store and traverse all keys & values without an index. I haven't used IDB indices before but it seems like indices are only needed if you want specific ordering of cursor results, and/or you want to be able to jump backwards and forwards by key. (?)

[rpiaggio]

Hi! I'm trying to use this functionality too.

You can open a ranged cursor over the store key, which is what I'm trying to do; see here: https://developer.mozilla.org/en-US/docs/Web/API/IDBKeyRange#examples

Would you mind sharing what you have so far so we can see if we can build upon it and send a PR?

[japgolly]

Hey @rpiaggio ! Yeah absolutely, I just pushed a topic/idbIndices now.

I don't remember the details, just that it became more complex that I expected. Or maybe I got a PoC working but once I saw the unit test, I didn't like the DSL? 🤷