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  • Dec 15 2019 20:06
    Mateiadrielrafael closed #54
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  • Mar 29 2019 10:35
Robin Munn
@rmunn
@btrepp - There's an RFC for expanding the capabilities of type proviers, currently in early proof-of-concept stage. Making lenses from record types automatically via a type provider was one of the use cases mentioned. Keep an eye on that one, and contribute if you're able to so that it gets completed faster, and that should be what you're looking for here.
btrepp
@btrepp
@rmunn Thanks!. Thats pretty exciting really. I will keep an eye on it.
btrepp
@btrepp
@Danl2620 serialize into what? (json?) there is a chiron gitter channel :)
Dan Liebgold
@Danl2620
(moved to xynchro/chiron)
varon
@varon
@kolektiv - xyncro/aether#47
Wojtek
@wklm
Hey Everyone :)
Could someone suggest a good example for working with nested jsons with chiron?
varon
@varon
@wklm - this is the aether channel. try the chiron one.
Wojtek
@wklm
@varon sorry, I chiron docs are pointing here
varon
@varon
no worries, probably needs a PR to fix that link
Wojtek
@wklm
:+1:
btrepp
@btrepp
So my first intro to lenses was aether, and I'm not too around the theory, but we have prism defined as Prism<'a,'b>: ('a->'b option),('a->'b->'a). I can somewhat intuit that, but sometimes I feel like I want to reach for something of the form Prism<'a,'b>: ('a-> Result<'b,string>),('a->'b->'a)
With the idea that the Prism ultimatelty tells us which part in the tree is missing
So when one goes Optic.get lens data we get Result<'a,string> with an error message about why the lens failed. (Which would be handy in logging)
Am I insane/missing the point?
Pete Johanson
@petejohanson
Shouldn't be too hard to write a function to compose prisms/lenses that way.
What are you trying to achieve by discovering where the None started in the chain?
May be slightly nicer to have the TError be a string list instead, that gets the chain appended too.
btrepp
@btrepp
Usually I've been using aether + chiron together. To parse into my own datastructures, it would be nice to debug how and why a lense failed to get a value
At the moment I find myself writing a would bunch of Result<'a,'b> code after I get specific parts of objects
giuliohome
@giuliohome
morning, I have a |> List.mapi on a list of a record type
If I want to assign (change) a member in the mapi fun, should I use a lens ?
Pete Johanson
@petejohanson
You certainly could. A lens will be more helpful if you're trying to change something ' in the record.
deeper'
giuliohome
@giuliohome
oh... deeper... you right
in this case maybe I just need record overload syntax thank you
Pete Johanson
@petejohanson
Yeah, also depends if you've already got lenses for your types defined, might as well use them.
Justin Rawlings
@jmjrawlings
Apologies if this has been asked before, but is there a way to use lenses to map between generic types? Something like this:
open Aether

let a : int option = Some 3

// This does not compile
let b : string option =
    a
    |> Optic.map Option.value_ string
varon
@varon
@jmjrawlings - This is a super late answer but...
Just map over the containing type.
a |> Option.map string
you don't need lenses in that case.
If you wanted to do it with lenses:
        let a : int option = Some 3

        let b : string option =
            a |> Optic.map string Option.value_
sashang
@sashang
Hi - how do I use chiron to query values from json data?
sorry wrong room
Torben Clasen
@Angr1st
If I have multiple Values inside of my Record that I want to use Optics to update. Could anyone be so kind to whip up a short example?