30 replies

Calculate only on a read action

Hello everyone. Just starting out with Ash and so far, so good. I'm starting to figure a few things out. What I'm currently struggling with is having a

calculate

calculate

only run on a

read

read

action.

I have an embedded resource where I'm using a

calculate

calculate

to generate a URL from another field. Here is a snippet from parent resource where the embedded is loaded:

  attributes do
    ...
    attribute :myembed, MyEmbed do
      constraints [load: [:url]]
      allow_nil? false
    end
    ...
  end

  attributes do
    ...
    attribute :myembed, MyEmbed do
      constraints [load: [:url]]
      allow_nil? false
    end
    ...
  end

That works and I get the calculated

:url

:url

field injected into the embedded resource when reading items. Yay! My issue is that the

:url

:url

field is also being written to the embedded field on

create

create

.

How can I have the calculate run only during the read actions?

I tried using a various

Ash.Query

Ash.Query

functions in a

prepare

prepare

in the read action of the embedded resource as well as in the read action of the parent, but couldn't get it load and/or not generate errors.

Ash Framework•4y ago•

30 replies

l00ker

Calculate only on a read action

Hello everyone. Just starting out with Ash and so far, so good. I'm starting to figure a few things out. What I'm currently struggling with is having a

calculate

calculate

only run on a

read

read

action.

I have an embedded resource where I'm using a

calculate

calculate

to generate a URL from another field. Here is a snippet from parent resource where the embedded is loaded:

  attributes do
    ...
    attribute :myembed, MyEmbed do
      constraints [load: [:url]]
      allow_nil? false
    end
    ...
  end

  attributes do
    ...
    attribute :myembed, MyEmbed do
      constraints [load: [:url]]
      allow_nil? false
    end
    ...
  end

That works and I get the calculated

:url

:url

field injected into the embedded resource when reading items. Yay! My issue is that the

:url

:url

field is also being written to the embedded field on

create

create

.

How can I have the calculate run only during the read actions?

I tried using a various

Ash.Query

Ash.Query

functions in a

prepare

prepare

in the read action of the embedded resource as well as in the read action of the parent, but couldn't get it load and/or not generate errors.

Calculate only on a read action

Similar Threads

Calculate only on a read action

Similar Threads

Similar Threads

Similar Threads