2 replies

ash extensions

I want to write an ash extension that works with ANY action. it is a custom validator + resolver

Aim: Validates that file exits and resolves the relative path to absolute path.

Ideally this DSL would do

actions do
    # Example action that validates a document upload
    action :process_document, :map do

>>>>>>>>>>>>>>>>>> 

      validate_file :document_path,
        max_size: "5.megabytes",
        allowed_types: [:pdf],
        base_path: "priv/uploads"

>>>>>>>>>>>>>>>>> 

      argument :document_path, :string, allow_nil?: false

      run fn input, _context ->
        # By the time we get here, document_path has been validated and
        # converted to an absolute path
        path = input.arguments.document_path

        {:ok, %{
          status: :processed,
          path: path,
          size: File.stat!(path).size
        }}
      end
    end

actions do
    # Example action that validates a document upload
    action :process_document, :map do

>>>>>>>>>>>>>>>>>> 

      validate_file :document_path,
        max_size: "5.megabytes",
        allowed_types: [:pdf],
        base_path: "priv/uploads"

>>>>>>>>>>>>>>>>> 

      argument :document_path, :string, allow_nil?: false

      run fn input, _context ->
        # By the time we get here, document_path has been validated and
        # converted to an absolute path
        path = input.arguments.document_path

        {:ok, %{
          status: :processed,
          path: path,
          size: File.stat!(path).size
        }}
      end
    end

actions do
    # Example action that validates a document upload
    action :process_document, :map do

>>>>>>>>>>>>>>>>>> 

      validate_file :document_path,
        max_size: "5.megabytes",
        allowed_types: [:pdf],
        base_path: "priv/uploads"

>>>>>>>>>>>>>>>>> 

      argument :document_path, :string, allow_nil?: false

      run fn input, _context ->
        # By the time we get here, document_path has been validated and
        # converted to an absolute path
        path = input.arguments.document_path

        {:ok, %{
          status: :processed,
          path: path,
          size: File.stat!(path).size
        }}
      end
    end

actions do
    # Example action that validates a document upload
    action :process_document, :map do

>>>>>>>>>>>>>>>>>> 

      validate_file :document_path,
        max_size: "5.megabytes",
        allowed_types: [:pdf],
        base_path: "priv/uploads"

>>>>>>>>>>>>>>>>> 

      argument :document_path, :string, allow_nil?: false

      run fn input, _context ->
        # By the time we get here, document_path has been validated and
        # converted to an absolute path
        path = input.arguments.document_path

        {:ok, %{
          status: :processed,
          path: path,
          size: File.stat!(path).size
        }}
      end
    end

i am inspired by
https://hexdocs.pm/ash/dsl-ash-resource.html#actions-create-validate

so this validate block is inside the