dawn locust
This is the best I got and it works wonders! The problem is that a decoder that decodes dynamic and I don't know how to use it with another decoder
fn decode_pair_properties() {
use pair_list <- decode.then(decode.list(decode_pair()))
pair_list |> dynamic.properties |> decode.success
}
fn decode_pair() {
use a <- decode.field(0, decode.dynamic)
use b <- decode.field(1, decode.dynamic)
decode.success(#(a, b))
}
remote scroll
Sounds you want decode.string
fn decode_pair() {
use a <- decode.field(0, decode.string)
use b <- decode.field(1, decode.string)
decode.success(#(a, b))
}
Oh I should have made it in the example that the data structure is recursive so like
[
#("name", "Lucy"),
#("favorite_food", "Strawberry ice cream"),
#("friends", [
#("name", "[[erlang mascott's name]]"),
#("favorite_food", "whatever octopus eat"),
#("friends", [])
...
])
]
You will need a recursive custom type and decode.one_of, something like this
type Value {
ValueString(String)
ValuePairs(List(#(String, Value)))
}
fn decode_pair() {
use a <- decode.field(0, decode.string)
use b <- decode.field(1, decode.one_of(
decode.string
|> decode.map(ValueString)
, [
decode.list(decode_pair())
|> decode.map(ValuePairs)
]))
decode.success(#(a, b))
}
But then won't I need to write a custom "decoder" to decode this further?
remote scroll
That above is the whole decoder ^, you can break that into smaller functions
Sorry, plus decode.list
let pairs= decode.run(dynamic_data, decode.list(decode_pair()))
Sorry, I should have made it clearer that I wanted to decode this into a struct like
type Mascot {
Mascot(name: String, favorite_food: String, friends: List(Mascot))
}
What is the input data like? Probably objects in JSON?
remote scroll
Don't know much about this
If this is https://hexdocs.pm/glua/glua.html#table_decoder what you are using
I would look into providing a decoder for that Mascot type you want (instead of list of tuples)
dawn locust
me trying not to xy problem challenge (impossible)
dawn locust
This feels like a relevant post
https://discord.com/channels/768594524158427167/1401908837719609414
Oh this post got bumped to the top oh joy