10 replies

How to run custom resource extension before validators

Hi there,

I'm writing my first

Ash.Resource

Ash.Resource

extension and having some issues I don't know how to solve. This is my simple extension so far:

defmodule EKG.Extensions.ScenePlaceable do
  use Spark.Dsl.Extension, transformers: [EKG.Extensions.ScenePlaceable.AddAttributes]
end

defmodule EKG.Extensions.ScenePlaceable.AddAttributes do
  use Spark.Dsl.Transformer

  def transform(dsl_state) do
    dsl_state
    |> Ash.Resource.Builder.add_new_attribute(:x, :integer,
      description: "X coordinate position",
      allow_nil?: false,
      public?: true,
      constraints: [min: 0]
    )
    # ... other attrs
  end
end

defmodule EKG.Extensions.ScenePlaceable do
  use Spark.Dsl.Extension, transformers: [EKG.Extensions.ScenePlaceable.AddAttributes]
end

defmodule EKG.Extensions.ScenePlaceable.AddAttributes do
  use Spark.Dsl.Transformer

  def transform(dsl_state) do
    dsl_state
    |> Ash.Resource.Builder.add_new_attribute(:x, :integer,
      description: "X coordinate position",
      allow_nil?: false,
      public?: true,
      constraints: [min: 0]
    )
    # ... other attrs
  end
end

All it does is add some attributes to the resource. But when I add

EKG.Extensions.ScenePlaceable

EKG.Extensions.ScenePlaceable

to the list of extensions of my resource I'm now getting this compile error:

== Compilation error in file lib/ekg/scenes/scene_widget.ex ==
** (Spark.Error.DslError) [EKG.Scenes.SceneWidget]
actions -> update -> accept:
  Cannot accept [:x, :y, :width, :height, :z_index], because they are not attributes."

== Compilation error in file lib/ekg/scenes/scene_widget.ex ==
** (Spark.Error.DslError) [EKG.Scenes.SceneWidget]
actions -> update -> accept:
  Cannot accept [:x, :y, :width, :height, :z_index], because they are not attributes."

So looks like that validation is running before my extension has a chance to add the attributes? As far as I'm aware the docs don't mention how to configure an extension to get around this issue, but I'm sure the fix is easy. Thank you for your help!

Solution

You can do this in your transformer:

def before?(Ash.Resource.Transformers.DefaultAccept), do: true
def before?(_), do: false

def before?(Ash.Resource.Transformers.DefaultAccept), do: true
def before?(_), do: false

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Ash Framework•7mo ago•

10 replies

How to run custom resource extension before validators

Hi there,

I'm writing my first

Ash.Resource

Ash.Resource

extension and having some issues I don't know how to solve. This is my simple extension so far:

defmodule EKG.Extensions.ScenePlaceable do
  use Spark.Dsl.Extension, transformers: [EKG.Extensions.ScenePlaceable.AddAttributes]
end

defmodule EKG.Extensions.ScenePlaceable.AddAttributes do
  use Spark.Dsl.Transformer

  def transform(dsl_state) do
    dsl_state
    |> Ash.Resource.Builder.add_new_attribute(:x, :integer,
      description: "X coordinate position",
      allow_nil?: false,
      public?: true,
      constraints: [min: 0]
    )
    # ... other attrs
  end
end

defmodule EKG.Extensions.ScenePlaceable do
  use Spark.Dsl.Extension, transformers: [EKG.Extensions.ScenePlaceable.AddAttributes]
end

defmodule EKG.Extensions.ScenePlaceable.AddAttributes do
  use Spark.Dsl.Transformer

  def transform(dsl_state) do
    dsl_state
    |> Ash.Resource.Builder.add_new_attribute(:x, :integer,
      description: "X coordinate position",
      allow_nil?: false,
      public?: true,
      constraints: [min: 0]
    )
    # ... other attrs
  end
end

All it does is add some attributes to the resource. But when I add

EKG.Extensions.ScenePlaceable

EKG.Extensions.ScenePlaceable

to the list of extensions of my resource I'm now getting this compile error:

== Compilation error in file lib/ekg/scenes/scene_widget.ex ==
** (Spark.Error.DslError) [EKG.Scenes.SceneWidget]
actions -> update -> accept:
  Cannot accept [:x, :y, :width, :height, :z_index], because they are not attributes."

== Compilation error in file lib/ekg/scenes/scene_widget.ex ==
** (Spark.Error.DslError) [EKG.Scenes.SceneWidget]
actions -> update -> accept:
  Cannot accept [:x, :y, :width, :height, :z_index], because they are not attributes."

Solution

You can do this in your transformer:

def before?(Ash.Resource.Transformers.DefaultAccept), do: true
def before?(_), do: false

def before?(Ash.Resource.Transformers.DefaultAccept), do: true
def before?(_), do: false

Jump to solution

How to run custom resource extension before validators

How to run custom resource extension before validators

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