How do I use a Union type as an action argument?

Given the following module and union type:

defmodule Insi.Subscriptions.SubscriptionPlan do
  use Ash.Resource...

  attributes do
    ...
    attribute :features, {:array, Feature} do
      public? true
      default []
    end
  end
  actions do
    ...
    update :add_features do
      argument :features, {:array, Feature}
      manual AddFeatures
    end
  end

  code_interface do
    define :add_features, args: [:features]
  end
end

defmodule Insi.Subscriptions.SubscriptionPlan do
  use Ash.Resource...

  attributes do
    ...
    attribute :features, {:array, Feature} do
      public? true
      default []
    end
  end
  actions do
    ...
    update :add_features do
      argument :features, {:array, Feature}
      manual AddFeatures
    end
  end

  code_interface do
    define :add_features, args: [:features]
  end
end

defmodule Insi.Subscriptions.Feature do
  use Ash.Type.NewType,
    subtype_of: :union,
    constraints: [
      types: [
        installations: [
          tag: :type,
          tag_value: :installations,
          type: :integer
          # constraints: [min: 0]
        ],
    ...
end

defmodule Insi.Subscriptions.Feature do
  use Ash.Type.NewType,
    subtype_of: :union,
    constraints: [
      types: [
        installations: [
          tag: :type,
          tag_value: :installations,
          type: :integer
          # constraints: [min: 0]
        ],
    ...
end

... how am I supposed to provide input to that SubscriptionPlan.add_features function? The following all blow up:

SubscriptionPlan.add_features([%Ash.Union{type: :installations, value: 1}]
SubscriptionPlan.add_features([%Ash.Union{type: :installations, content: 1}]
SubscriptionPlan.add_features([%{type: :installations, value: 1}]
SubscriptionPlan.add_features([%{type: :installations, content: 1}]

SubscriptionPlan.add_features([%Ash.Union{type: :installations, value: 1}]
SubscriptionPlan.add_features([%Ash.Union{type: :installations, content: 1}]
SubscriptionPlan.add_features([%{type: :installations, value: 1}]
SubscriptionPlan.add_features([%{type: :installations, content: 1}]

I think I've tried all those variations with string keys as well. I'm not even getting to the manual action before I keep getting this error:

%Ash.Error.Changes.InvalidArgument{field: :features, message: "is not a map", value: [%Ash.Union{value: 1, type: :installations}]...}

%Ash.Error.Changes.InvalidArgument{field: :features, message: "is not a map", value: [%Ash.Union{value: 1, type: :installations}]...}

Or sometimes the message is just "is invalid". Help?

Solution:

You can't use the tag/tag value for types that aren't maps

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7 Replies

ZachDaniel•4mo ago

You should just be able to pass in integers Oh

Solution

ZachDaniel•4mo ago

You can't use the tag/tag value for types that aren't maps

ZachDaniel•4mo ago

Because there is nowhere to put the tag in You don't need the tag or tag value for integers generally

⿻ eileenOP•4mo ago

Hmmmmm. Gonna play around with making it a map. I do need the tags because the union has multiple integer types Or maybe I can just do tuples ... {:installations, 2}

ZachDaniel•4mo ago

You could do tuples or maps, yes

⿻ eileenOP•4mo ago

Actually just removing the tag and tag_value totally fixed it Now I have %{type: :installations, value: 1} which is exactly what I wanted!

ZachDaniel•4mo ago

🥳

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How do I use a Union type as an action argument?

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