Elex.AshValidation (Elex v0.2.1)

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Ash resource validation for Elex expression strings.

Validates that a string attribute contains a syntactically valid expression that type-checks against a Elex.Context and returns the expected type.

This module is only compiled when Ash.Resource.Validation is available (the :ash dependency is optional).

Examples

defmodule MyApp.Resource do
  use Ash.Resource

  attributes do
    attribute :formula, :string do
      allow_nil? false
    end
  end

  validations do
    validate Elex.AshValidation,
      attribute: :formula,
      context: Elex.new_context(),
      expected_type: :decimal
  end
end

Options

  • :attribute (required) — Atom name of the attribute containing the expression
  • :context (required) — A Elex.Context defining allowed variables and functions
  • :expected_type (required) — Expected result type (:decimal, :boolean, or :string)
  • :add_value_type_from_attribute — When set to an attribute atom, adds a "value" variable to the context with the type from that attribute's current value
  • :description — Optional description shown in validation error messages