AF
Ash Framework•13h ago
Songyun

Anonymous Function Queries (Preparations)

I can't seem to get the syntax right, what am I doing wrong? 
  preparations do
    prepare fn query, context ->
      case query.tenant do
        %MyApp.Orgs.Org{id: id} ->
          query
          |> Ash.Query.filter(org_id == ^id)

        _ ->
          query
      end
    end
  end
  preparations do
    prepare fn query, context ->
      case query.tenant do
        %MyApp.Orgs.Org{id: id} ->
          query
          |> Ash.Query.filter(org_id == ^id)

        _ ->
          query
      end
    end
  end
It yells at me for the org_id var and use of the pin operator. I tried without (org_id: id) and got a different error.
2 Replies
Songyun
SongyunOP•8h ago
I got this working in a separate module. I don't understand why it doesn't work in an anon. func with a resource's global preparations, though. 
defmodule MyApp.Preparations.ScopeToTenant do
  use Ash.Resource.Preparation

  @impl true
  def prepare(query, _opts, context) do
    case context.tenant do
      nil ->
        query

      %CombatLog.Orgs.Org{id: id} ->
        query
        |> Ash.Query.filter(org_id == ^id)
    end
  end
end
defmodule MyApp.Preparations.ScopeToTenant do
  use Ash.Resource.Preparation

  @impl true
  def prepare(query, _opts, context) do
    case context.tenant do
      nil ->
        query

      %CombatLog.Orgs.Org{id: id} ->
        query
        |> Ash.Query.filter(org_id == ^id)
    end
  end
end
Would also appreciate an explanation for why nil checks are necessary in these if anyone knows.
ZachDaniel
ZachDaniel•7h ago
🤔 I thought we fixed that, but in preparations, Ash.Query is required automatically I thought that was the case for resources too, but perhaps not Yeah, it should be requiring Ash.Query AFAICT are you on a recent version of Ash?

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