Is there anything in Ash or Elixir to update a value in a nested map when a value in another map changes based on conditions from dynamic user supplied templates? map0 = %{ data: %{true_sum: 0} } map1 = %{ data: %{true_count: 0, field: false} } map2 = %{ data: %{true_count: 0, field: false,…

I’m trying to have users create dynamic forms with conditions to show/hide fields and update values on other fields. Fields can depend on multiple other fields that also depend on other fields. I thought there was a dependency solving library for Elixir or Ash, but those may be for static structs a…

There is a lot of context here that makes it kind of a vague question TBH. Ash can solve for dynamic calculations (i.e not known at compile time) in some ways but its not necessarily a sort of “arbitrary dynamic data dependency solver”, its targeted to a relatively specific use case. I don’t think y…

[image] user20230119: I’m trying to have users create dynamic forms with conditions to show/hide fields and update values on other fields. Fields can depend on multiple other fields that also depend on other fields. Yeah, this is not trivial. I’m sure you are going to have to essentially “whi…

[image] zachdaniel: Agreed, in Ash we have calculations for this purpose Not that I know what I’m talking about WRT Ash, but these are in the “model” layer, right? Like, they exist on Ecto schemas or similar? What would be more relevant for this problem is a similar feature but in the “UI” l…

[image] garrison: Not that I know what I’m talking about WRT Ash, but these are in the “model” layer, right? Like, they exist on Ecto schemas or similar? Sort of. They can be used for rendering etc, but maybe not best in this case. [image] garrison: What would be more relevant for this p…

[image] zachdaniel: I agree that there may be room for a certain kind of higher level tooling over assigns, but I would much rather (personally) have a pure function of state → rendered page for this kind of thing. It’s funny because I saw a similar response from Jose and some others the last…

[image] garrison: It’s funny because I saw a similar response from Jose and some others the last time I posted about this too. I feel like there might be a “React PTSD” factor here where people see me cite React and instantly recoil in horror. And, I mean, I get it. Ultimately we can factor R…

[image] zachdaniel: Ultimately we can factor React out of the equation. Better not to worry about psychological reasons others disagree with us as it’s ultimately reductive in the debate and could easily be flipped around Mm, what I meant is that I worry my use of React as an example of the A…

[image] garrison: P.S. I cannot imagine how much experience you need to hold that many reduce/update invocations in your head, I must have read that at least 10 times lol I’m just a freak of nature :stuck_out_tongue_closed_eyes: [image] garrison: I would really prefer to maintain the ass…

[image] zachdaniel: Honestly I wouldn’t personally worry too much about this. I think it’s much better to have something like assign_reactive and assign as separate concepts entirely. Helps with context switching when you have to work on something where it isn’t available also. I could live w…

Update attribute if other dependent attributes change like Observables?

Ash Forum Ash Questions / Help

user20230119 May 19, 2025, 10:51pm 17

@Jskalc mentioned your post in a thread about signals.

@MarthinL would observables or signals be helpful for dynamic recursive trees?