How to send a response that is different from the default one?

Ash Forum Ash Questions / Help
1

In my Ash resource, I’ve defined an action which returns a map like below:

actions do
  action :get_presigned_url, :map do
    run fn _, _ ->
      ...
      {:ok, %{filename: filename, presigned_url: presigned_url}}
    end
  end
end

But the above code returns an error saying that

an exception was raised:
    ** (Spark.Error.DslError) [MyApp.Domain]
json_api -> routes -> get -> get_presigned_url_for_audio:
  Invalid return type for generic action used in get route.

Expected type `:struct`
Expected constraints: instance_of: Dharana.Resource

Got type: Ash.Type.Map
Got constraints: []

Is it possible to do what I’m trying to do? I’m looking for a way to only send the map as the response through Ash

2

You can specify the return type of a generic action as the second argument. However, the error message feels wrong to me, as you don’t have a return type specified at the moment.

actions do
  action :get_presigned_url, :map do
    run fn _, _ ->
      ...
      {:ok, %{filename: filename, presigned_url: presigned_url}}
    end
  end
end
3

@barnabasJ Apologies! I did specify the return type in as a map in my actual code but forgot to mention it in the post. I’ve edited the original question now which includes the return type.

4

In that case you probably need to use route instead of get for a generic action

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